Update README.md

Author: froque

README.md

@@ -26,6 +26,8 @@ plugin works pretty much like the standard shell script support.
 
 ### [Unreleased]
 
+ - [fixed serialization issue that occurs in some scenarios](https://github.com/jenkinsci/powershell-plugin/pull/17), fixes [JENKINS-65613 After upgrading to powershell-plugin 1.5 enabling/disabling projects causes an error](https://issues.jenkins.io/browse/JENKINS-65613)
+
 ### [Version 1.5] (2021-05-04)
 
 - [Added selection of preferred PowerShell version for Windows machines](https://github.com/jenkinsci/powershell-plugin/pull/16)