Remove 8.7.0 CHANGELOG

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
-v 8.7.0 (unreleased)
-  - The Projects::HousekeepingService class has extra instrumentation (Yorick Peterse)
-  - All service classes (those residing in app/services) are now instrumented (Yorick Peterse)
-  - Enable gzip for assets, makes the page size significantly smaller. !3544 / !3632 (Connor Shea)
-  - Load award emoji images separately unless opening the full picker. Saves several hundred KBs of data for most pages. (Connor Shea)
-  - All images in discussions and wikis now link to their source files !3464 (Connor Shea).
-  - Return status code 303 after a branch DELETE operation to avoid project deletion (Stan Hu)
-  - Improved Markdown rendering performance !3389 (Yorick Peterse)
-  - Don't attempt to look up an avatar in repo if repo directory does not exist (Stan Hu)
-  - Expose project badges in project settings
-  - Preserve time notes/comments have been updated at when moving issue
-  - Make HTTP(s) label consistent on clone bar (Stan Hu)
-  - Expose label description in API (Mariusz Jachimowicz)
-  - Allow back dating on issues when created through the API
-  - Fix Error 500 after renaming a project path (Stan Hu)
-  - Fix avatar stretching by providing a cropping feature
-  - API: Expose `subscribed` for issues and merge requests (Robert Schilling)
-  - Allow SAML to handle external users based on user's information !3530
-  - Add endpoints to archive or unarchive a project !3372
-  - Add links to CI setup documentation from project settings and builds pages
-  - Handle nil descriptions in Slack issue messages (Stan Hu)
-  - API: Expose open_issues_count, closed_issues_count, open_merge_requests_count for labels (Robert Schilling)
-  - Add default scope to projects to exclude projects pending deletion
-  - Ensure empty recipients are rejected in BuildsEmailService
-  - API: Ability to filter milestones by state `active` and `closed` (Robert Schilling)
-  - API: Fix milestone filtering by `iid` (Robert Schilling)
-  - API: Delete notes of issues, snippets, and merge requests (Robert Schilling)
-  - Implement 'Groups View' as an option for dashboard preferences !3379 (Elias W.)
-  - Better errors handling when creating milestones inside groups
-  - Hide `Create a group` help block when creating a new project in a group
-  - Implement 'TODOs View' as an option for dashboard preferences !3379 (Elias W.)
-  - Gracefully handle notes on deleted commits in merge requests (Stan Hu)
-  - Fix creation of merge requests for orphaned branches (Stan Hu)
-  - API: Ability to retrieve a single tag (Robert Schilling)
-  - Fall back to `In-Reply-To` and `References` headers when sub-addressing is not available (David Padilla)
-  - Remove "Congratulations!" tweet button on newly-created project. (Connor Shea)
-  - Fix admin/projects when using visibility levels on search (PotHix)
-  - Build status notifications
-  - API: Expose user location (Robert Schilling)
-  - ClosingIssueExtractor regex now also works with colons. e.g. "Fixes: #1234" !3591
-  - Update number of Todos in the sidebar when it's marked as "Done". !3600
-  - API: Expose 'updated_at' for issue, snippet, and merge request notes (Robert Schilling)
-  - API: User can leave a project through the API when not master or owner. !3613
-
 v 8.6.6
   - Expire the exists cache before deletion to ensure project dir actually exists (Stan Hu). !3413
   - Fix error on language detection when repository has no HEAD (e.g., master branch) (Jeroen Bobbeldijk). !3654