Prepare Release using 'release-plan'

Author: MelSumner

release-plan-stderr.txt

@@ -0,0 +1,7 @@
+# Unlabeled Changes
+
+* `ember-a11y-testing`
+  * [#603](https://github.com/ember-a11y/ember-a11y-testing/pull/603) refactor(styles): move global styles to dedicated globals.scss file ([@lem0n4id](https://github.com/lem0n4id))
+
+
+*Cannot plan release until the above changes are labeled*.