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

Closes #65

Author: greenkeeper[bot]

package.json

@@ -74,7 +74,7 @@
     "chai": "4.1.2",
     "coveralls": "^3.0.0",
     "eslint": "5.0.1",
-    "eslint-loader": "2.1.0",
+    "eslint-loader": "4.0.1",
     "feathers": "^2.2.4",
     "feathers-errors": "^2.9.2",
     "feathers-hooks": "^2.1.2",