contributing: Weston now uses GitLab MRs

Note that Weston uses GitLab MRs for review, not mail.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
1 job for master in 1 minute and 51 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #16521
build-native

00:01:51