[Deps] fix typescript-eslint-parser to avoid picking up breaking change

Author: alexzherdev

package.json

@@ -39,7 +39,7 @@
     "istanbul": "^0.4.5",
     "mocha": "^5.2.0",
     "typescript": "^3.1.3",
-    "typescript-eslint-parser": "^20.0.0"
+    "typescript-eslint-parser": "20.0.0"
   },
   "peerDependencies": {
     "eslint": "^3.0.0 || ^4.0.0 || ^5.0.0"