Add 8.12.10, 8.12.11, and 8.12.12 CHANGELOG-EE.md items

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

CHANGELOG-EE.md

@@ -81,6 +81,18 @@ Please view this file on the master branch, on stable branches it's out of date.
 - Fix a search for non-default branches when ES is enabled
 - Re-organized the Sidekiq queues for EE specific workers
 
+## 8.12.12 (2016-12-08)
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+- No changes.
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+## 8.12.11 (2016-12-02)
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+- No changes.
+
+## 8.12.10 (2016-11-28)
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+- No changes.
+
 ## 8.12.9 (2016-11-07)
 
 - No changes