D3665: graph: improve graph output by using Unicode characters

[smf (Sean Farley)]

smf added a comment.


  Could you send me the output of `hg export REV | head` or do you just want me to add your name and not worry about the date/time, etc.?

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3665

To: johnstiles, #hg-reviewers, spectral
Cc: spectral, indygreg, smf, yuja, mercurial-devel