Revert "Add 2.11.3 changelog to develop"

This reverts commit d266536.

Author: chenwany

CHANGELOG.md

@@ -64,14 +64,6 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 **BUG FIXES**
 - Fix cluster update when using proxy setup
 
-2.11.3
------
-
-**BUG FIXES**
-- Fix failure when building AMI, due to SGE sources not available at arc.liv.ac.uk
-- Fix cluster update when using proxy setup.
-- Update ca-certificates package during AMI build time and prevent Chef from using outdated/distrusted CA certificates.
-
 2.11.2
 -----