Add changelog entry for v4.3.0-pre.2

CHANGELOG.md

@@ -4,6 +4,21 @@ All notable changes to this project will be documented in this file.
 
 <!-- New entries go after this line -->
 
+## v4.3.0-pre.2 - 2021-06-07 [Pre-release]
+
+[See the full changelog](https://github.com/thelounge/thelounge/compare/v4.3.0-pre.1...v4.3.0-pre.2)
+
+This is a pre-release for v4.3.0 to offer latest changes without having to wait for a stable release.
+At this stage, features may still be added or modified until the first release candidate for this version gets released.
+
+Please refer to the commit list given above for a complete list of changes, or wait for the stable release to get a thoroughly prepared change log entry.
+
+As with all pre-releases, this version requires explicit use of the `next` tag to be installed:
+
+```sh
+yarn global add thelounge@next
+```
+
 ## v4.3.0-pre.1 - 2021-03-02 [Pre-release]
 
 [See the full changelog](https://github.com/thelounge/thelounge/compare/v4.2.0...v4.3.0-pre.1)