gem5 version 20.1.0.3
misc: Updated the RELEASE-NOTES and version number

Updated the RELEASE-NOTES.md and version number for the v20.1.0.3
hotfix release.

Change-Id: I95ab84ea259f5e0529ebaa32be65d9a14370f219
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40435
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
3 files changed