CONTRIBUTING: link to PR guide.
mercury 14.01
mercury: update 14.01 bottle.

Closes #30530.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
CONTRIBUTING: fix dashes.
Use accessor method in test
verliator 3.862
nudge formatting

Needed for Emacs' ruby highlighting to work past this point in the file.
ATS/Postiats 0.1.0 (New formula)
ats2-postiats: add 0.1.0 bottle.