Upgrade ember-cli-babel

Author: NullVoxPopuli

test-app/package.json

@@ -41,7 +41,7 @@
     "ember-auto-import": "^2.6.3",
     "ember-cli": "~4.12.2",
     "ember-cli-app-version": "^6.0.0",
-    "ember-cli-babel": "^7.26.11",
+    "ember-cli-babel": "^8.2.0",
     "ember-cli-dependency-checker": "^3.3.1",
     "ember-cli-htmlbars": "^6.2.0",
     "ember-cli-inject-live-reload": "^2.1.0",