Update CHANGELOG.md with 11.11.x patch releases

Patch releases are missing on master and only present in 11-11-stable
branch which is not very clear what changed for the user.

CHANGELOG.md

+v11.11.2 (2019-01-03)
+
+- Fix support for SELinux volume mounts & case sensitivity !1381
+- Fix case sensitivity for windows volumes !1389
+- Update logging key for Docker Machine !1361
+- Limit `docker-windows` to Windows !1362
+- Make volumes to work on linux docker on windows !1363
+
+v11.11.1 (2019-05-24)
+
+- Fix volume mounting when mode specified !1357
+- Add documentation for Windows Docker Executor !1345
+- Add feature flag to mounting volumes to services !1352
+
 v11.11.0 (2019-05-22)
 
 - Fix PowerShell cloning !1338