chore(package): update eslint to version 6.6.0

Closes #217

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "babel-jest": "^23.6.0",
     "babel-minify-webpack-plugin": "^0.3.1",
     "clean-webpack-plugin": "^0.1.19",
-    "eslint": "^5.12.0",
+    "eslint": "^6.6.0",
     "eslint-config-google": "^0.11.0",
     "jest": "^23.6.0",
     "webpack": "^4.19.1",