Add changelog

Signed-off-by: Joas Schilling <coding@schilljs.com>

CHANGELOG.md

@@ -0,0 +1,18 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+## 1.13.2 – 2022-07-11
+### Fixed
+- Fix UI not showing when a tag for any rule is missing
+  [#186](https://github.com/nextcloud/files_retention/pull/186)
+- Show an error when saving a retention rule fails
+  [#181](https://github.com/nextcloud/files_retention/pull/181)
+- Fix error when trying to add a retention rule
+  [#183](https://github.com/nextcloud/files_retention/pull/183)
+
+## 1.12.1 – 2022-07-11
+### Fixed
+- Fix UI not showing when a tag for any rule is missing
+  [#185](https://github.com/nextcloud/files_retention/pull/185)
+- Fix untranslated strings in admin settings
+  [#180](https://github.com/nextcloud/files_retention/pull/180)