chore(package): update babel-loader to version 6.4.1 (#1741)

https://greenkeeper.io/

package.json

@@ -11,7 +11,7 @@
     "async": "~2.1.2",
     "babel": "~6.23.0",
     "babel-core": "~6.24.0",
-    "babel-loader": "~6.3.0",
+    "babel-loader": "~6.4.1",
     "babel-preset-es2015": "~6.24.0",
     "babelify": "~7.3.0",
     "bower": "~1.8.0",