Update CHANGELOG.md

Author: Outek

CHANGELOG.md

@@ -9,6 +9,9 @@
   - Moved strings to localization file.
 - Changed the scope from Global to Script in MSFT_ScheduledTask.Integration.Tests.ps1
 - Changed the scope from Global to Script ComputerManagementDsc.Common.Tests.ps1
+
+## 5.1.0.0
+
 - TimeZone:
   - Migrated xTimeZone resource from [xTimeZone](https://github.com/PowerShell/xTimeZone)
     and renamed to TimeZone - fixes [Issue #157](https://github.com/PowerShell/ComputerManagementDsc/issues/157).