Update changelog

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## Unreleased
+## [2.3.0] - 2020-03-01
 
 ### Security
 
@@ -103,9 +103,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - Mastodon API: Support for expires_in/expires_at in the Filters.
 </details>
 
-## Unreleased (Patch)
-
-
 ## [2.2.2] - 2020-01-18
 
 ### Fixed