Merge pull request #4113 from mozilla/greenkeeper/es6-error-4.1.0

Update es6-error to the latest version 🚀

package.json

@@ -160,7 +160,7 @@
     "config": "1.28.1",
     "deep-eql": "3.0.1",
     "dompurify": "1.0.2",
-    "es6-error": "4.0.2",
+    "es6-error": "4.1.0",
     "express": "4.16.2",
     "extract-text-webpack-plugin": "3.0.2",
     "fastclick": "1.0.6",