chore(package): update ember-ajax to version 5.0.0

Closes #19

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "babelify": "^7.3.0",
     "broccoli-asset-rev": "^2.4.5",
     "chai": "^3.5.0",
-    "ember-ajax": "^2.4.1",
+    "ember-ajax": "^5.0.0",
     "ember-browserify": "1.1.13",
     "ember-cli": "2.10.0",
     "ember-cli-app-version": "^2.0.0",