chore(package): update eslint to version 6.8.0

Closes #91

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
   "devDependencies": {
     "codecov": "^3.0.0",
     "cz-conventional-changelog": "^2.1.0",
-    "eslint": "^5.6.0",
+    "eslint": "^6.8.0",
     "jasmine": "^3.2.0",
     "nyc": "^13.0.1",
     "protractor": "^5.4",