COMPMID-959 Updated changelog for 18.03

Change-Id: I079f1db4f66740c8202684d7422896faec7cd54b
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/122857
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
1 file changed