README: we use MRs for code reviews now, not email

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
10 jobs for !1223 with readme-update in 3 minutes and 53 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Containers Build
passed #403621
debian

00:00:19

 
  Build+Test
canceled #403623
meson-clang

00:03:33

canceled #403627
meson-clover

00:03:32

canceled #403626
meson-main

00:03:32

canceled #403622
meson-swr-glvnd

00:03:32

passed #403628
meson-vulkan

00:02:16

canceled #403630
scons-llvm

00:03:32

canceled #403629
scons-nollvm

00:03:32

canceled #403624
scons-swr

00:03:33

canceled #403625
scons-win64

00:03:32