2.15.0 readiness

Updates the CHANGELOG.md to set the release date.

CHANGELOG.md

@@ -2,27 +2,28 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.15.0 - TBD
+## 2.15.0 - 2021-09-20
 
-### Added
 
-- Nothing.
+-----
 
-### Changed
+### Release Notes for [2.15.0](https://github.com/laminas/laminas-feed/milestone/10)
 
-- Nothing.
+Feature release (minor)
 
-### Deprecated
+### 2.15.0
 
-- Nothing.
+- Total issues resolved: **0**
+- Total pull requests resolved: **2**
+- Total contributors: **2**
 
-### Removed
+#### Enhancement
 
-- Nothing.
+ - [42: Provide PHP 8.1 support](https://github.com/laminas/laminas-feed/pull/42) thanks to @weierophinney
 
-### Fixed
+#### Duplicate,Enhancement
 
-- Nothing.
+ - [39: Remove file headers](https://github.com/laminas/laminas-feed/pull/39) thanks to @ghostwriter
 
 ## 2.14.0 - 2021-03-16