chore(package): update ember-cli-qunit to version 2.2.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -34,7 +34,7 @@
     "ember-cli-jshint": "^1.0.0",
     "ember-cli-mirage": "0.1.13",
     "ember-cli-moment-shim": "2.0.0",
-    "ember-cli-qunit": "2.1.0",
+    "ember-cli-qunit": "2.2.0",
     "ember-cli-release": "^0.2.9",
     "ember-cli-sass": "5.4.0",
     "ember-cli-sri": "^2.1.0",