Update CHANGELOG

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CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.2.0 (unreleased)
-  - Ensure MySQL CI limits DB migrations occur after the fields have been created (Stan Hu)
   - Improved performance of replacing references in comments
   - Fix duplicate repositories in GitHub import page (Stan Hu)
-  - Redirect to a default path if HTTP_REFERER is not set (Stan Hu)
   - Show last project commit to default branch on project home page
   - Highlight comment based on anchor in URL
   - Adds ability to remove the forked relationship from project settings screen. (Han Loong Liauw)
@@ -12,6 +10,8 @@ v 8.2.0 (unreleased)
   - Allow users to select the Files view as default project view (Cristian Bica)
 
 v 8.1.0 (unreleased)
+  - Ensure MySQL CI limits DB migrations occur after the fields have been created (Stan Hu)
+  - Redirect to a default path if HTTP_REFERER is not set (Stan Hu)
   - Send an email to admin email when a user is reported for spam (Jonathan Rochkind)
   - Show notifications button when user is member of group rather than project (Grzegorz Bizon)
   - Fix bug preventing mentioned issued from being closed when MR is merged using fast-forward merge.