chore(package): update @typescript-eslint/parser to version 3.1.0

Closes #77

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.12.14",
     "@typescript-eslint/eslint-plugin": "^2.9.0",
-    "@typescript-eslint/parser": "^2.9.0",
+    "@typescript-eslint/parser": "^3.1.0",
     "chai": "^4.1.2",
     "coveralls": "^3.0.2",
     "eslint": "^6.7.1",