Merge pull request #117 from LLK/greenkeeper/babel-core-6.23.1

chore(package): update babel-core to version 6.23.1

package.json

@@ -27,7 +27,7 @@
   },
   "devDependencies": {
     "autoprefixer": "6.7.2",
-    "babel-core": "6.22.1",
+    "babel-core": "6.23.1",
     "babel-eslint": "7.1.1",
     "babel-loader": "6.3.2",
     "babel-plugin-transform-object-rest-spread": "6.22.0",