chore(package): update ember-qunit to version 4.4.0

Closes #30

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "ember-export-application-global": "^2.0.0",
     "ember-load-initializers": "^1.1.0",
     "ember-maybe-import-regenerator": "^0.1.6",
-    "ember-qunit": "^3.4.1",
+    "ember-qunit": "^4.4.0",
     "ember-resolver": "^5.0.1",
     "ember-source": "~3.6.0",
     "ember-source-channel-url": "^1.1.0",