2.12.5 readiness

Updates the CHANGELOG.md to set the release date.

CHANGELOG.md

@@ -2,27 +2,24 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.12.5 - TBD
+## 2.12.5 - 2020-12-31
 
-### Added
-
-- Nothing.
 
-### Changed
-
-- Nothing.
+-----
 
-### Deprecated
+### Release Notes for [2.12.5](https://github.com/laminas/laminas-mail/milestone/9)
 
-- Nothing.
+2.12.x bugfix release (patch)
 
-### Removed
+### 2.12.5
 
-- Nothing.
+- Total issues resolved: **0**
+- Total pull requests resolved: **1**
+- Total contributors: **1**
 
-### Fixed
+#### Bug
 
-- Nothing.
+ - [108: Fix Invalid header line for Content-Disposition string - incomplete continuation](https://github.com/laminas/laminas-mail/pull/108) thanks to @glensc
 
 ## 2.12.3 - TBD