chore(package): update ember-source to version 2.16.0

Author: greenkeeper[bot]

package.json

@@ -58,7 +58,7 @@
     "ember-load-initializers": "^1.0.0",
     "ember-resolver": "^4.3.0",
     "ember-sinon": "^1.0.0",
-    "ember-source": "~2.15.0",
+    "ember-source": "~2.16.0",
     "glob": "^7.0.0",
     "loader.js": "^4.2.3",
     "mocha": "^4.0.0",