fix(dependencies): fixed node version

Author: BowlingX

circle.yml

@@ -4,7 +4,7 @@ general:
       - gh-pages
 machine:
   node:
-    version: 4.1.0
+    version: 6.1.0
 test:
   override:
     - npm test

package.json

@@ -25,6 +25,7 @@
   "devDependencies": {
     "autoprefixer": "^6.3.3",
     "babel-cli": "^6.18.0",
+    "babel-core": "^6.22.1",
     "babel-eslint": "^6.1.2",
     "babel-loader": "^6.2.10",
     "babel-plugin-transform-runtime": "^6.3.13",