chore(package): update eslint to version 6.5.1

Closes #95

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
     "commitizen": "^3.1.1",
     "concurrently": "^4.0.1",
     "cz-conventional-changelog": "^2.1.0",
-    "eslint": "^5.16.0",
+    "eslint": "^6.5.1",
     "express": "^4.16.4",
     "istanbul": "^0.4.5",
     "jasmine-core": "^3.4.0",