misc: Changed gem5 version info for gem5 20.2 dev

Change-Id: I34505c054f1ec83f5da169bfde90702f3da3917e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/35439
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
3 files changed