Merge pull request #62 from ember-polyfills/dependabot/npm_and_yarn/ember-cli-3.21.2

Author: dependabot-preview[bot]

package.json

@@ -39,7 +39,7 @@
     "babel-eslint": "^10.0.3",
     "broccoli-asset-rev": "^3.0.0",
     "ember-auto-import": "^1.6.0",
-    "ember-cli": "~3.15.1",
+    "ember-cli": "~3.21.2",
     "ember-cli-dependency-checker": "^3.2.0",
     "ember-cli-inject-live-reload": "^2.0.1",
     "ember-cli-sri": "^2.1.1",