Adding a changelog

CHANGELOG.md

@@ -0,0 +1,27 @@
+# CHANGELOG
+
+## HEAD (Unreleased)
+
+_(none)_
+
+---
+
+## 2.1.0 (2021-03-17)
+
+- Add ability to create stack if not already exists by passing `upsert: true`
+  [#118](https://github.com/pulumi/actions/pull/118)
+- Add ability to pass program options to the Pulumi CLI
+  [#117](https://github.com/pulumi/actions/pull/117)
+  - `parallel`
+  - `message`
+  - `expect-no-changes`
+  - `diff`
+  - `replace`
+  - `target`
+  - `target-dependents`
+- Reject PRs with changes to the `dist/` folder to reduce any potential security
+  issues [#119](https://github.com/pulumi/actions/pull/119)
+
+## 2.0.1 (2021-02-26)
+
+- Initial reworking of the Action to be TypeScript based