Update CHANGELOG.md

Author: demartinofra

CHANGELOG.md

@@ -3,18 +3,25 @@ aws-parallelcluster-cookbook CHANGELOG
 
 This file is used to list changes made in each version of the AWS ParallelCluster cookbook.
 
-
 2.10.3
------
+------
+**ENHANCEMENTS**
+
+- Enable support for ARM instances in China and GovCloud regions when using Ubuntu 18.04 or Amazon Linux 2. 
 
 **CHANGES**
+
 - Upgrade EFA installer to version 1.11.2
-  - EFA configuration: ``efa-config-1.7`` (no change)
-  - EFA profile: ``efa-profile-1.4`` (from ``efa-profile-1.3``)
-  - EFA kernel module: ``efa-1.10.2`` (no change)
-  - RDMA core: ``rdma-core-31.2amzn`` (no change)
-  - Libfabric: ``libfabric-1.11.1amzn1.0`` (no change)
-  - Open MPI: ``openmpi40-aws-4.1.0`` (no change)
+  - EFA configuration: efa-config-1.7 (no change)
+  - EFA profile: efa-profile-1.4 (from efa-profile-1.3)
+  - EFA kernel module: efa-1.10.2 (no change)
+  - RDMA core: rdma-core-31.2amzn (no change)
+  - Libfabric: libfabric-1.11.1amzn1.0 (no change)
+  - Open MPI: openmpi40-aws-4.1.0 (no change)
+
+**BUG FIXES**
+
+- Fix issue with ``awsbsub`` command when setting environment variables for the job submission 
 
 2.10.2
 -----