update SPM support

Package.resolved

@@ -0,0 +1,16 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "Nimble",
+        "repositoryURL": "https://github.com/Quick/Nimble.git",
+        "state": {
+          "branch": null,
+          "revision": "7fd118ec8795888bcbbebc1a41f6984454c4cd6f",
+          "version": "8.0.7"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

@@ -1,8 +1,20 @@
+// swift-tools-version:5.0
 import PackageDescription
 
 let package = Package(
-   name: "SwiftyFormat",
-   dependencies: [
-      .Package(url: "https://github.com/Quick/Nimble", majorVersion: 5, minor: 1)
-   ]
+    name: "SwiftyFormat",
+    platforms: [
+        .macOS(.v10_10), .iOS(.v8), .tvOS(.v9), .watchOS(.v2)
+    ],
+    products: [
+        .library(name: "SwiftyFormat", targets: ["SwiftyFormat"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/Quick/Nimble.git", from: "8.0.0")
+    ],
+    targets: [
+        .target(name: "SwiftyFormat", dependencies: [], path: "Source"),
+        .testTarget(name: "SwiftyFormatTests", dependencies: ["SwiftyFormat", "Nimble"]),
+    ],
+    swiftLanguageVersions: [.v5]
 )

README.md

@@ -58,7 +58,7 @@ SwiftyFormat supports Swift 5
 
 Cocoapods:
 ```
-pod "SwiftyFormat", :git => 'https://github.com/Alamofire/Alamofire.git'
+pod "SwiftyFormat", :git => 'https://github.com/Igor-Palaguta/SwiftyFormat.git'
 ```
 `
 
@@ -67,6 +67,11 @@ Carthage:
 github "Igor-Palaguta/SwiftyFormat"
 ```
 
+SPM:
+```
+.package(url: "https://github.com/Igor-Palaguta/SwiftyFormat.git", from: "0.3.0")
+```
+
 ## Author
 
 Igor Palaguta, igor.palaguta@gmail.com