D482: bundle2: fixed usage of an attribute that was removed in py3k

[indygreg (Gregory Szorc)]

indygreg accepted this revision.
indygreg added a comment.
This revision is now accepted and ready to land.


  The commit message should likely say something about how the existing use of `string.letters` was logically wrong, since it is locale dependent. `string.ascii_letters` is definitely the variable we should have been using all along.

REPOSITORY
  rHG Mercurial

BRANCH
  py3k-stuff (bookmark) on default (branch)

REVISION DETAIL
  https://phab.mercurial-scm.org/D482

To: alex.gaynor, durin42, #hg-reviewers, indygreg
Cc: indygreg, mercurial-devel