chore(package): update eslint to version 6.7.1

Closes #3

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "coveralls": "^3.0.3",
     "cross-env": "^5.0.5",
     "dedupe": "^3.0.1",
-    "eslint": "^5.16.0",
+    "eslint": "^6.7.1",
     "karma": "^4.1.0",
     "karma-browserify": "^6.0.0",
     "karma-mocha": "^1.3.0",