Create Changelog.md for changelists

CHANGELOG.md

@@ -0,0 +1,12 @@
+# Changelog
+
+## Unreleased Changes
+
+## v1.2.0
+- Reverted the breaking behavior change in v1.1.0 that broke custom authentication flows
+
+## v1.1.0 (Not reccomended for use, this functionality will be ported to the 2.0 update)
+- Persist `with.token` or `${{ github.token }}` into checkout repository's git config as `http.https://github.com/.extraheader=AUTHORIZATION: basic ***` to better support scripting git
+
+## v1.0.0
+- Initial Release of the checkout action