Update README.md

Author: terma

README.md

@@ -103,6 +103,10 @@ To fix that:
 
 ## Changelog
 
+### [1.9.0](https://github.com/jenkinsci/github-pr-coverage-status-plugin/releases/tag/github-pr-coverage-status-1.9.0)
+
+- Add support of Workflow SCM Step Plugin
+
 ### [1.8.2](https://github.com/jenkinsci/github-pr-coverage-status-plugin/releases/tag/github-pr-coverage-status-1.8.2)
 
 - Fix Master showing 0% even after RecordMasterCoverage is run