2.3.1 readiness

Updates the CHANGELOG.md to set the release date.

CHANGELOG.md

@@ -20,27 +20,24 @@ Total issues resolved: **5**
 - [152: Ocramius/PackageVersions is not compatible with composer configuration "lock: false"](https://github.com/Ocramius/PackageVersions/issues/152) thanks to @windaishi
 - [155: BC break: removed deprecated `PackageVersions\Versions::ROOT_PACKAGE_NAME` constant](https://github.com/Ocramius/PackageVersions/pull/155) thanks to @Ocramius
 
-## 2.3.1 - TBD
+## 2.3.1 - 2022-03-05
 
-### Added
 
-- Nothing.
-
-### Changed
+-----
 
-- Nothing.
+### Release Notes for [2.3.1](https://github.com/Ocramius/PackageVersions/milestone/41)
 
-### Deprecated
 
-- Nothing.
 
-### Removed
+### 2.3.1
 
-- Nothing.
+- Total issues resolved: **0**
+- Total pull requests resolved: **1**
+- Total contributors: **1**
 
-### Fixed
+#### enhancement,help wanted
 
-- Nothing.
+ - [199: Raise awareness of current Russia-Ukraine situation, targeting Russian 🇷🇺  readers](https://github.com/Ocramius/PackageVersions/pull/199) thanks to @github-actions[bot]
 
 ## 2.3.0 - 2020-12-23