Update CHANGELOG

Author: crazy-max

CHANGELOG.md

@@ -1,13 +1,17 @@
 # Changelog
 
-## 3.0.0 (2020/08/20)
+## 3.0.0 (2020/08/21)
 
 * Move `GITHUB_TOKEN` env var to `github-token` input
 * Rename `yaml_file` input to `yaml-file`
 * Rename `skip_delete` input to `skip-delete`
 * Rename `dry_run` input to `dry-run`
 * Refactor and add tests
 
+## 2.1.1 (2020/08/21)
+
+* Add deprecation message since v3
+
 ## 2.1.0 (2020/07/22)
 
 * Handle [@actions/github](https://github.com/actions/toolkit/tree/main/packages/github) v4