Adds missing contribution to CHANGELOG

CHANGELOG.md

@@ -12,7 +12,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Fixed
 
-- Fixes [#1898](https://github.com/gitkraken/vscode-gitlens/issues/1898) - Hovers display old Gravatar
+- Fixes [#1898](https://github.com/gitkraken/vscode-gitlens/issues/1898) - Hovers display old Gravatar — thanks to [PR #1899](https://github.com/gitkraken/vscode-gitlens/pull/1899) by Leo Dan Peña ([@amouxaden](https://github.com/amouxaden))
 
 ## [12.0.4] - 2022-03-10