Update CHANGELOG-EE.md for 8.16.0-ee

[ci skip]

CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 8.16.0 (2017-02-22)
+
+- Allow to limit shared runners minutes quota for group. !965
+- About GitLab link in sidebar that links to help page. !1008
+- Prevent 500 error when uploading/entering a blank license. !1016
+- Add more push rules to the API. !1022 (Robert Schilling)
+- Expose issue weight in the API. !1023 (Robert Schilling)
+- Copy <some text> to clipboard. !1048
+
 ## 8.15.5 (2017-01-20)
 
 - No changes.

changelogs/unreleased-ee/allow-to-limit-build-minutes-quota.yml

----
-title: Allow to limit shared runners minutes quota for group
-merge_request: 965
-author:

changelogs/unreleased-ee/api-issue-weight.yml

----
-title: Expose issue weight in the API
-merge_request: 1023
-author: Robert Schilling

changelogs/unreleased-ee/api-push-rules.yml

----
-title: Add more push rules to the API
-merge_request: 1022
-author: Robert Schilling

changelogs/unreleased-ee/clipboard-button-text.yml

----
-title: 'Copy <some text> to clipboard'
-merge_request: 1048

changelogs/unreleased-ee/gracefully_handle_new_license_error.yml

----
-title: Prevent 500 error when uploading/entering a blank license
-merge_request: 1016
-author:

changelogs/unreleased-ee/view-ce-vs-ee.yml

----
-title: About GitLab link in sidebar that links to help page
-merge_request: 1008
-author: