graph: improve graph output by using Unicode characters
This extension beautifies log -G output by using Unicode characters.
A terminal with UTF-8 support and a monospace Unicode font are required.
Differential Revision: https://phab.mercurial-scm.org/D3665
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}