chore(package): update eslint-loader to version 4.0.2

Closes #18

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
         "babel-eslint": "^9.0.0",
         "cross-env": "^5.0.1",
         "eslint": "^5.6.0",
-        "eslint-loader": "^2.0.0",
+        "eslint-loader": "^4.0.2",
         "eslint-plugin-html": "^4.0.5",
         "eslint-plugin-vue": "^4.0.0",
         "lighthouse-ci": "https://github.com/ebidel/lighthouse-ci",