Add changelog entries for 11.2.3 and 11.1.6

CHANGELOG.md

@@ -4,7 +4,9 @@ entry.
 ## 11.2.3 (2018-08-28)
-- No changes.
+### Fixed (1 change)
+
+- Fixed cache invalidation issue with diff lines from 11.2.2.
 ## 11.2.2 (2018-08-27)
@@ -269,7 +271,9 @@ entry.
 ## 11.1.6 (2018-08-28)
-- No changes.
+### Fixed (1 change)
+
+- Fixed cache invalidation issue with diff lines from 11.2.2.
 ## 11.1.5 (2018-08-27)