fix(package): update ember-cli-babel to version 7.17.2

Closes #12

Author: greenkeeper[bot]

package.json

@@ -20,7 +20,7 @@
     "test": "ember try:each"
   },
   "dependencies": {
-    "ember-cli-babel": "^6.6.0",
+    "ember-cli-babel": "^7.17.2",
     "ember-cli-htmlbars": "^2.0.1"
   },
   "devDependencies": {