Updates release date for v.1.2.0

Author: LordHepipud

doc/30-upgrading-framework.md

@@ -4,7 +4,7 @@ Upgrading Icinga PowerShell Framework is usually quite straightforward.
 
 Specific version upgrades are described below. Please note that version updates are incremental.
 
-## Upgrading to v1.2.0 (pending)
+## Upgrading to v1.2.0 (2020-08-28)
 
 ### Behavior changes
 

doc/31-Changelog.md

@@ -7,7 +7,7 @@ documentation before upgrading to a new release.
 
 Released closed milestones can be found on [GitHub](https://github.com/Icinga/icinga-powershell-framework/milestones?state=closed).
 
-## 1.2.0 (pending)
+## 1.2.0 (2020-08-28)
 
 [Issue and PRs](https://github.com/Icinga/icinga-powershell-framework/milestone/7?closed=1)