fix(package): update babel-loader to version 6.4.0 (#1359)

https://greenkeeper.io/

package.json

@@ -45,7 +45,7 @@
     "ansi-html": "0.0.7",
     "babel-core": "6.23.1",
     "babel-generator": "6.22.0",
-    "babel-loader": "6.3.2",
+    "babel-loader": "6.4.0",
     "babel-plugin-module-resolver": "2.5.0",
     "babel-plugin-react-require": "3.0.0",
     "babel-plugin-transform-class-properties": "6.22.0",