chore(package): update ember-cli to version 3.16.1

Closes #56

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
     "@ember/optional-features": "^0.7.0",
     "broccoli-asset-rev": "^3.0.0",
     "chai": "^4.2.0",
-    "ember-cli": "~3.8.1",
+    "ember-cli": "~3.16.1",
     "ember-cli-chai": "^0.5.0",
     "ember-cli-dependency-checker": "^3.1.0",
     "ember-cli-eslint": "^5.1.0",