chore(package): update ember-cli to version 3.16.0

Closes #60

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "commitizen": "^3.1.2",
     "cz-conventional-changelog": "^2.1.0",
-    "ember-cli": "~3.12.0",
+    "ember-cli": "~3.16.0",
     "ember-cli-code-coverage": "^1.0.0-beta.8",
     "ember-cli-dependency-checker": "^3.0.0",
     "ember-cli-eslint": "^5.0.0",