Update CHANGELOG.md for 11.3.5

[ci skip]

Author: GitLab Release Tools Bot

CHANGELOG.md

@@ -2,6 +2,14 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 11.3.5 (2018-10-15)
+
+### Fixed (2 changes)
+
+- Fix loading issue on some merge request discussion. !21982
+- Fix project deletion when there is a export available. !22276
+
+
 ## 11.3.3 (2018-10-04)
 
 - No changes.