chore(package): update ember-cli-babel to version 6.7.0

Closes #58

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "ember-browserify": "^1.1.9",
     "ember-cli": "2.11.1",
     "ember-cli-app-version": "^2.0.0",
-    "ember-cli-babel": "^5.1.6",
+    "ember-cli-babel": "^6.7.0",
     "ember-cli-dependency-checker": "^1.2.0",
     "ember-cli-htmlbars": "^1.0.3",
     "ember-cli-htmlbars-inline-precompile": "^0.3.1",