Update CHANGELOG.md for 10.2.3

[ci skip]

CHANGELOG.md

@@ -2,6 +2,25 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
+## 10.2.3 (2017-11-30)
+
+### Fixed (7 changes)
+
+- Fix hashed storage for Import/Export uploads. !15482
+- Ensure that rake gitlab:cleanup:repos task does not mess with hashed repositories. !15520
+- Ensure that rake gitlab:cleanup:dirs task does not mess with hashed repositories. !15600
+- Fix WIP system note not being created.
+- Fix link text from group context.
+- Fix defaults for MR states and merge statuses.
+- Fix pulling and pushing using a personal access token with the sudo scope.
+
+### Performance (3 changes)
+
+- Drastically improve project search performance by no longer searching namespace name.
+- Reuse authors when rendering event Atom feeds.
+- Optimise StuckCiJobsWorker using cheap SQL query outside, and expensive inside.
+
+
 ## 10.2.2 (2017-11-23)
 ### Fixed (5 changes)

changelogs/unreleased/40291-ignore-hashed-repos-cleanup-repositories.yml

----
-title: Ensure that rake gitlab:cleanup:repos task does not mess with hashed repositories
-merge_request: 15520
-author:
-type: fixed

changelogs/unreleased/40352-ignore-hashed-repos-cleanup-dirs.yml

----
-title: Ensure that rake gitlab:cleanup:dirs task does not mess with hashed repositories
-merge_request: 15600
-author:
-type: fixed

changelogs/unreleased/default-values-for-mr-states.yml

----
-title: Fix defaults for MR states and merge statuses
-merge_request:
-author:
-type: fixed

changelogs/unreleased/dm-fix-registry-with-sudo-token.yml

----
-title: Fix pulling and pushing using a personal access token with the sudo scope
-merge_request:
-author:
-type: fixed

changelogs/unreleased/dm-project-search-performance.yml

----
-title: Drastically improve project search performance by no longer searching namespace
-  name
-merge_request:
-author:
-type: performance

changelogs/unreleased/events-atom-feed-author-query.yml

----
-title: Reuse authors when rendering event Atom feeds
-merge_request:
-author:
-type: performance

changelogs/unreleased/fix-import-uploads-hashed-storage.yml

----
-title: Fix hashed storage for Import/Export uploads
-merge_request: 15482
-author:
-type: fixed

changelogs/unreleased/issue_40374.yml

----
-title: Fix WIP system note not being created
-merge_request:
-author:
-type: fixed

changelogs/unreleased/jk-group-mentions-fix.yml

----
-title: Fix link text from group context
-merge_request:
-author:
-type: fixed

changelogs/unreleased/optimise-stuck-ci-jobs-worker.yml

----
-title: Optimise StuckCiJobsWorker using cheap SQL query outside, and expensive inside
-merge_request:
-author:
-type: performance