Update dependency ember-cli to v3.8.0

Author: renovate-bot

Diff for: package.json

@@ -40,7 +40,7 @@
     "babel-plugin-transform-decorators-legacy": "1.3.5",
     "babel-plugin-transform-object-rest-spread": "6.26.0",
     "broccoli-asset-rev": "3.0.0",
-    "ember-cli": "3.5.0",
+    "ember-cli": "3.8.0",
     "ember-cli-code-coverage": "1.0.0-beta.8",
     "ember-cli-dependency-checker": "3.1.0",
     "ember-cli-eslint": "4.2.3",