Merge pull request #8 from lgaticaq/greenkeeper-babel-core-6.7.7

babel-core@6.7.7 breaks build 🚨

Author: lgaticaq

package.json

@@ -38,7 +38,7 @@
   },
   "devDependencies": {
     "babel-cli": "^6.8.0",
-    "babel-core": "^6.7.2",
+    "babel-core": "^6.7.7",
     "babel-preset-es2015": "^6.6.0",
     "chai": "^3.5.0",
     "eslint": "^2.4.0",