chore(package): update @typescript-eslint/parser to version 2.3.1

Closes #38

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "@types/jest": "^24.0.4",
     "@types/node": "^11.9.3",
     "@typescript-eslint/eslint-plugin": "^1.2.0",
-    "@typescript-eslint/parser": "^1.2.0",
+    "@typescript-eslint/parser": "^2.3.1",
     "codecov": "^3.1.0",
     "eslint": "^5.9.0",
     "eslint-config-airbnb-base": "^13.1.0",