Merge pull request #297 from rust-lang/greenkeeper-ember-cli-2.4.3

Update ember-cli to version 2.4.3 🚀

Author: alexcrichton

package.json

@@ -22,7 +22,7 @@
   "license": "MIT",
   "devDependencies": {
     "broccoli-asset-rev": "^2.2.0",
-    "ember-cli": "2.4.2",
+    "ember-cli": "2.4.3",
     "ember-cli-app-version": "^1.0.0",
     "ember-cli-babel": "^5.1.5",
     "ember-cli-dependency-checker": "^1.1.0",