Update CHANGELOG for 8.8.2

[ci skip]

CHANGELOG

@@ -8,14 +8,20 @@ v 8.9.0 (unreleased)
   - Fix issues filter when ordering by milestone
   - Todos will display target state if issuable target is 'Closed' or 'Merged'
 
-v 8.8.2 (unreleased)
-  - Fix Error 500 when accessing application settings due to nil disabled OAuth sign-in sources
-  - Fix Error 500 in CI charts by gracefully handling commits with no durations
-  - Fix concurrent request when updating build log in browser
+v 8.8.2
+  - Added remove due date button. !4209
+  - Fix Error 500 when accessing application settings due to nil disabled OAuth sign-in sources. !4242
+  - Fix Error 500 in CI charts by gracefully handling commits with no durations. !4245
+  - Fix table UI on CI builds page. !4249
+  - Fix backups if registry is disabled. !4263
+  - Fixed issue with merge button color. !4211
+  - Fixed issue with enter key selecting wrong option in dropdown. !4210
+  - When creating a .gitignore file a dropdown with templates will be provided. !4075
+  - Fix concurrent request when updating build log in browser. !4183
 
 v 8.8.1
   - Add documentation for the "Health Check" feature
-  - Allow anonymous users to access a public project's pipelines
+  - Allow anonymous users to access a public project's pipelines !4233
   - Fix MySQL compatibility in zero downtime migrations helpers
   - Fix the CI login to Container Registry (the gitlab-ci-token user)