Update CHANGELOG.md for 8.13.10

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CHANGELOG.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 8.13.10 (2016-12-14)
+
+- API: Memoize the current_user so that sudo can work properly. !8017
+- Filter `authentication_token`, `incoming_email_token` and `runners_token` parameters.
+- Issue#visible_to_user moved to IssuesFinder to prevent accidental use.
+- Fix missing Note access checks by moving Note#search to updated NoteFinder.
+
 ## 8.13.9 (2016-12-08)
 
 - Reenables /user API request to return private-token if user is admin and request is made with sudo. !7615

changelogs/unreleased/25482-fix-api-sudo.yml

----
-title: 'API: Memoize the current_user so that sudo can work properly'
-merge_request: 8017
-author:

changelogs/unreleased/filter-parameters.yml

----
-title: 'Filter `authentication_token`, `incoming_email_token` and `runners_token` parameters'
-merge_request:
-author:

changelogs/unreleased/jej-24637-move-issue-visible_to_user-to-finder.yml

----
-title: Issue#visible_to_user moved to IssuesFinder to prevent accidental use
-merge_request: 
-author: 

changelogs/unreleased/jej-note-search-uses-finder.yml

----
-title: Fix missing Note access checks by moving Note#search to updated NoteFinder
-merge_request: 
-author: