Update CHANGELOG.md after v0.21.0

ewbankkit · web-flow · commit 62d5e5f66649 · 2022-05-13T08:17:47.000-04:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,4 +1,5 @@
-## 0.21.0 (Unreleased)
+## 0.22.0 (Unreleased)
+## [0.21.0](https://github.com/hashicorp/terraform-provider-awscc/releases/tag/v0.21.0) (May 12, 2022)
 
 FEATURES:
 
