Merge branch 'remove-duplicate-changelog-entry' into 'master'

Remove duplicate entry in the changelog

/cc @DouweM 

See merge request !2149

CHANGELOG

@@ -5,7 +5,6 @@ v 8.3.0 (unreleased)
   - Add open_issues_count to project API (Stan Hu)
   - Expand character set of usernames created by Omniauth (Corey Hinshaw)
   - Add button to automatically merge a merge request when the build succeeds (Zeger-Jan van de Weg)
-  - Merge when build succeeds (Zeger-Jan van de Weg)
   - Provide better diagnostic message upon project creation errors (Stan Hu)
   - Bump devise to 3.5.3 to fix reset token expiring after account creation (Stan Hu)
   - Bump gollum-lib to 4.1.0 (Stan Hu)