diff --git a/.babelrc b/.babelrc
index a0b096a..dc2875e 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,9 +1,9 @@
 {
     "presets": [
-        ["@babel/preset-env", { "loose": true }]
+        ["@babel/preset-env", { "loose": true, "useBuiltIns": "entry" }]
     ],
     "plugins": [
-        "@babel/proposal-class-properties",
+        ["@babel/proposal-class-properties", { "loose": true }],
         "add-module-exports"
     ],
     "env": {
diff --git a/package-lock.json b/package-lock.json
index 7db5830..e995cbe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "postcss-selector-parser",
-  "version": "5.0.0",
+  "version": "6.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1775,9 +1775,9 @@
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-      "resolved": "https://registry.npmjs.org/coveralls/-/coveralls-3.0.2.tgz",
-      "integrity": "sha512-Tv0LKe/MkBOilH2v7WBiTBdudg2ChfGbdXafc/s330djpF3zKOmuehTeRwjXWc7pzfj9FrDUTA7tEx6Div8NFw==",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/coveralls/-/coveralls-3.0.3.tgz",
+      "integrity": "sha512-viNfeGlda2zJr8Gj1zqXpDMRjw9uM54p7wzZdvLRyOgnAfCe974Dq4veZkjJdxQXbmdppu6flEajFYseHYaUhg==",
       "dev": true,
       "requires": {
         "growl": "~> 1.10.0",
@@ -1785,7 +1785,7 @@
         "lcov-parse": "^0.0.10",
         "log-driver": "^1.2.7",
         "minimist": "^1.2.0",
-        "request": "^2.85.0"
+        "request": "^2.86.0"
       }
     },
     "create-error-class": {
@@ -2904,25 +2904,29 @@
       "dependencies": {
         "abbrev": {
           "version": "1.1.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+          "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
           "dev": true,
           "optional": true
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
           "dev": true,
           "optional": true
         },
         "aproba": {
           "version": "1.2.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+          "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
           "dev": true,
           "optional": true
         },
         "are-we-there-yet": {
           "version": "1.1.5",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+          "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -2932,13 +2936,15 @@
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         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+          "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
           "dev": true,
           "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+          "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
           "dev": true,
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           "requires": {
@@ -2948,37 +2954,43 @@
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           "version": "1.1.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.1.tgz",
+          "integrity": "sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g==",
           "dev": true,
           "optional": true
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+          "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
           "dev": true,
           "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+          "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
           "dev": true,
           "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+          "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
           "dev": true,
           "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+          "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
           "dev": true,
           "optional": true
         },
         "debug": {
           "version": "2.6.9",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
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           "requires": {
@@ -2987,25 +2999,29 @@
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         "deep-extend": {
           "version": "0.6.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
+          "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==",
           "dev": true,
           "optional": true
         },
         "delegates": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+          "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
           "dev": true,
           "optional": true
         },
         "detect-libc": {
           "version": "1.0.3",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-1.0.3.tgz",
+          "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=",
           "dev": true,
           "optional": true
         },
         "fs-minipass": {
           "version": "1.2.5",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-1.2.5.tgz",
+          "integrity": "sha512-JhBl0skXjUPCFH7x6x61gQxrKyXsxB5gcgePLZCwfyCGGsTISMoIeObbrvVeP6Xmyaudw4TT43qV2Gz+iyd2oQ==",
           "dev": true,
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           "requires": {
@@ -3014,13 +3030,15 @@
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         "fs.realpath": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
+          "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
           "dev": true,
           "optional": true
         },
         "gauge": {
           "version": "2.7.4",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/gauge/-/gauge-2.7.4.tgz",
+          "integrity": "sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=",
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           "optional": true,
           "requires": {
@@ -3036,7 +3054,8 @@
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         "glob": {
           "version": "7.1.3",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.3.tgz",
+          "integrity": "sha512-vcfuiIxogLV4DlGBHIUOwI0IbrJ8HWPc4MU7HzviGeNho/UJDfi6B5p3sHeWIQ0KGIU0Jpxi5ZHxemQfLkkAwQ==",
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@@ -3050,13 +3069,15 @@
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         "has-unicode": {
           "version": "2.0.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/has-unicode/-/has-unicode-2.0.1.tgz",
+          "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
           "dev": true,
           "optional": true
         },
         "iconv-lite": {
           "version": "0.4.24",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
+          "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
           "dev": true,
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           "requires": {
@@ -3065,7 +3086,8 @@
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         "ignore-walk": {
           "version": "3.0.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/ignore-walk/-/ignore-walk-3.0.1.tgz",
+          "integrity": "sha512-DTVlMx3IYPe0/JJcYP7Gxg7ttZZu3IInhuEhbchuqneY9wWe5Ojy2mXLBaQFUQmo0AW2r3qG7m1mg86js+gnlQ==",
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@@ -3074,7 +3096,8 @@
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         "inflight": {
           "version": "1.0.6",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
+          "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
           "dev": true,
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           "requires": {
@@ -3084,19 +3107,22 @@
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         "inherits": {
           "version": "2.0.3",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+          "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
           "dev": true,
           "optional": true
         },
         "ini": {
           "version": "1.3.5",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.5.tgz",
+          "integrity": "sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==",
           "dev": true,
           "optional": true
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
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           "requires": {
@@ -3105,13 +3131,15 @@
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         "isarray": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+          "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
           "dev": true,
           "optional": true
         },
         "minimatch": {
           "version": "3.0.4",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
+          "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
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@@ -3120,13 +3148,15 @@
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           "version": "0.0.8",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+          "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
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         "minipass": {
           "version": "2.3.5",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/minipass/-/minipass-2.3.5.tgz",
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@@ -3136,7 +3166,8 @@
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-1.2.1.tgz",
+          "integrity": "sha512-7+4oTUOWKg7AuL3vloEWekXY2/D20cevzsrNT2kGWm+39J9hGTCBv8VI5Pm5lXZ/o3/mdR4f8rflAPhnQb8mPA==",
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@@ -3145,7 +3176,8 @@
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+          "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
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@@ -3154,13 +3186,15 @@
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-          "bundled": true,
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+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
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           "version": "2.2.4",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/needle/-/needle-2.2.4.tgz",
+          "integrity": "sha512-HyoqEb4wr/rsoaIDfTH2aVL9nWtQqba2/HvMv+++m8u0dz808MaagKILxtfeSN7QU7nvbQ79zk3vYOJp9zsNEA==",
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@@ -3171,7 +3205,8 @@
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/node-pre-gyp/-/node-pre-gyp-0.10.3.tgz",
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@@ -3189,7 +3224,8 @@
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/nopt/-/nopt-4.0.1.tgz",
+          "integrity": "sha1-0NRoWv1UFRk8jHUFYC0NF81kR00=",
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@@ -3199,13 +3235,15 @@
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/npm-bundled/-/npm-bundled-1.0.5.tgz",
+          "integrity": "sha512-m/e6jgWu8/v5niCUKQi9qQl8QdeEduFA96xHDDzFGqly0OOjI7c+60KM/2sppfnUU9JJagf+zs+yGhqSOFj71g==",
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         "npm-packlist": {
           "version": "1.2.0",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/npm-packlist/-/npm-packlist-1.2.0.tgz",
+          "integrity": "sha512-7Mni4Z8Xkx0/oegoqlcao/JpPCPEMtUvsmB0q7mgvlMinykJLSRTYuFqoQLYgGY8biuxIeiHO+QNJKbCfljewQ==",
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@@ -3215,7 +3253,8 @@
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/npmlog/-/npmlog-4.1.2.tgz",
+          "integrity": "sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==",
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@@ -3227,19 +3266,22 @@
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-          "bundled": true,
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           "version": "4.1.1",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
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-          "bundled": true,
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@@ -3248,19 +3290,22 @@
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
+          "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
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+          "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
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-          "bundled": true,
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@@ -3270,19 +3315,22 @@
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+          "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
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-          "bundled": true,
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@@ -3294,7 +3342,8 @@
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+              "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+              "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
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@@ -3302,7 +3351,8 @@
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@@ -5543,7 +5719,8 @@
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@@ -5552,12 +5729,14 @@
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@@ -5566,12 +5745,14 @@
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@@ -5580,7 +5761,8 @@
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@@ -5588,17 +5770,20 @@
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-          "bundled": true,
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@@ -5609,7 +5794,8 @@
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@@ -5619,7 +5805,8 @@
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@@ -5627,12 +5814,14 @@
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-          "bundled": true,
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@@ -5641,7 +5830,8 @@
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@@ -5649,17 +5839,20 @@
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+          "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
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         "wordwrap": {
           "version": "0.0.3",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
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-          "bundled": true,
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+          "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
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@@ -5668,12 +5861,14 @@
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             "is-fullwidth-code-point": {
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-              "bundled": true,
+              "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+              "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
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@@ -5681,7 +5876,8 @@
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+              "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
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@@ -5691,7 +5887,8 @@
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@@ -5701,12 +5898,14 @@
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+          "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
           "dev": true
         },
         "write-file-atomic": {
           "version": "2.4.2",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.2.tgz",
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@@ -5716,17 +5915,20 @@
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+          "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
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           "version": "2.1.2",
-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+          "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
           "dev": true
         },
         "yargs": {
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-          "bundled": true,
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
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@@ -5745,7 +5947,8 @@
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-          "bundled": true,
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diff --git a/package.json b/package.json
index 4e04778..5e0b2c1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "postcss-selector-parser",
-  "version": "5.0.0",
+  "version": "6.0.0",
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@@ -10,11 +10,11 @@
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     "babel-eslint": "^10.0.1",
     "babel-plugin-add-module-exports": "^1.0.0",
-    "coveralls": "^3.0.2",
+    "coveralls": "^3.0.3",
     "del-cli": "^1.1.0",
     "eslint": "^5.14.1",
     "eslint-plugin-babel": "^5.3.0",
-    "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-import": "^2.16.0",
     "glob": "^7.1.3",
     "minimist": "^1.2.0",
     "nyc": "^13.3.0",