Bump ts-node from 8.0.3 to 8.1.0 in /functions (#72)

Bumps [ts-node](https://github.com/TypeStrong/ts-node) from 8.0.3 to 8.1.0.
- [Release notes](https://github.com/TypeStrong/ts-node/releases)
- [Commits](TypeStrong/ts-node@v8.0.3...v8.1.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

functions/package.json

@@ -27,7 +27,7 @@
  "devDependencies": {
  "@types/tape": "^4.2.33",
  "prettier": "*",
- "ts-node": "8.0.3",
+ "ts-node": "8.1.0",
  "tslint": "~5.16.0",
  "typescript": "~3.4.4"
  },

functions/yarn.lock

@@ -2490,10 +2490,10 @@ tough-cookie@~2.4.3:
  psl "^1.1.24"
  punycode "^1.4.1"
 
-ts-node@8.0.3:
- version "8.0.3"
- resolved "https://registry.yarnpkg.com/ts-node/-/ts-node-8.0.3.tgz#aa60b836a24dafd8bf21b54766841a232fdbc641"
- integrity sha512-2qayBA4vdtVRuDo11DEFSsD/SFsBXQBRZZhbRGSIkmYmVkWjULn/GGMdG10KVqkaGndljfaTD8dKjWgcejO8YA==
+ts-node@8.1.0:
+ version "8.1.0"
+ resolved "https://registry.yarnpkg.com/ts-node/-/ts-node-8.1.0.tgz#8c4b37036abd448577db22a061fd7a67d47e658e"
+ integrity sha512-34jpuOrxDuf+O6iW1JpgTRDFynUZ1iEqtYruBqh35gICNjN8x+LpVcPAcwzLPi9VU6mdA3ym+x233nZmZp445A==
  dependencies:
  arg "^4.1.0"
  diff "^3.1.0"