update changelog

Author: marcuspoehls

CHANGELOG.md

@@ -1,6 +1,16 @@
 # Changelog
 
 
+## [1.2.0](https://github.com/superchargejs/redis-github-action/compare/v1.1.0...v1.2.0) - 2021-01-08
+
+### Added
+- version check before starting the Redis container: fall back to `latest` when no Redis version is defined for the workflow
+- run tests on pull requests
+
+### Updated
+- refined wording in Readme
+
+
 ## [1.1.0](https://github.com/superchargejs/redis-github-action/compare/v1.0.0...v1.1.0) - 2019-12-18
 
 ### Updated