D171: phabricator: include the suggested arc config in the repo

[durin42 (Augie Fackler)]

durin42 accepted this revision as: durin42.
durin42 added subscribers: durham, quark.
durin42 added a comment.


  This looks fine to me, but I also have no idea what I'm doing. I'd appreciate someone with more arc experience letting me know if  "history.immutable" : false being missing from the included-in-repo arcconfig will be a burden on those of us that have history mutation enabled...
  
  @durham @quark

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D171

To: alex_gaynor, durin42, #hg-reviewers
Cc: quark, durham, mercurial-devel