Add changelog item

CHANGELOG

@@ -13,6 +13,7 @@ v 8.7.0 (unreleased)
   - 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
   - Implement 'Groups View' as an option for dashboard preferences !3379 (Elias W.)
   - Implement 'TODOs View' as an option for dashboard preferences !3379 (Elias W.)