Update CHANGELOG.md for 11.6.11

[ci skip]

CHANGELOG.md

@@ -1128,6 +1128,30 @@ entry.
 - Update url placeholder for the sentry configuration page. !24338
 
 
+## 11.6.11 (2019-04-23)
+
+### Security (2 changes)
+
+- Fixed ability to see private groups by users not belonging to given group.
+- Fix XSS in resolve conflicts form.
+
+### Fixed (2 changes)
+
+- Bring back Rugged implementation of find_commit. !25477
+- Avoid excessive recursive calls with Rugged TreeEntries. !26813
+
+### Performance (1 change)
+
+- Bring back Rugged implementation of ListCommitsByOid. !27441
+
+### Other (4 changes)
+
+- Bring back Rugged implementation of GetTreeEntries. !25674
+- Bring back Rugged implementation of CommitIsAncestor. !25702
+- Bring back Rugged implementation of TreeEntry. !25706
+- Bring back Rugged implementation of commit_tree_entry. !25896
+
+
 ## 11.6.10 (2019-02-28)
 
 ### Security (21 changes)