chore(package): update eslint-loader to version 4.0.1

Closes #14

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "eslint": "^6.5.1",
     "eslint-config-airbnb": "^18.0.1",
     "eslint-config-prettier": "^6.4.0",
-    "eslint-loader": "^3.0.2",
+    "eslint-loader": "^4.0.1",
     "eslint-plugin-import": "^2.18.2",
     "eslint-plugin-jsx-a11y": "^6.2.3",
     "eslint-plugin-prettier": "^3.1.1",