[Versioning] Fix CHANGELOG for 3.1.5

Signed-off-by: Francesco Giordano <[email protected]>

Author: francesco-giordano

CHANGELOG.md

@@ -7,6 +7,7 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 ------
 
 **ENHANCEMENTS**
+- Fix Slurm issue that prevents idle nodes termination.
 - Upgrade EFA installer to `1.18.0`
   - Efa-driver: `efa-1.16.0-1`
   - Efa-config: `efa-config-1.11-1`
@@ -15,6 +16,11 @@ This file is used to list changes made in each version of the AWS ParallelCluste
   - Rdma-core: `rdma-core-41.0-2`
   - Open MPI: `openmpi40-aws-4.1.4-2`
 
+**CHANGES**
+- Upgrade Intel MPI Library to 2021.6.0.602.
+- Upgrade NVIDIA driver to version 470.141.03.
+- Upgrade NVIDIA Fabric Manager to version 470.141.03.
+
 3.1.4
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