Update changelog

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## [Unreleased](https://github.com/pixelfed/pixelfed/compare/v0.11.1...dev)
 
+### Breaking
+- Dropped support for PHP 7.3 [#3041](https://github.com/pixelfed/pixelfed/pull/3041)
+
 ### Added
 - Manual email verification requests. ([bc659387](https://github.com/pixelfed/pixelfed/commit/bc659387))
 - Added StatusMentionService, fixes #3026. ([e5387d67](https://github.com/pixelfed/pixelfed/commit/e5387d67))