chore(package): update babel-core to version 6.18.2

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -9,7 +9,7 @@
   },
   "bugs": "https://github.com/static-dev/spike-core/issues",
   "dependencies": {
-    "babel-core": "^6.17.0",
+    "babel-core": "^6.18.2",
     "babel-loader": "^6.2.5",
     "browser-sync": "^2.17.0",
     "browser-sync-webpack-plugin": "^1.1.2",