Merge branch 'br/mergetools-guiffy'

"git mergetools" learned talking to guiffy. * br/mergetools-guiffy: mergetools: add support for guiffy

Junio C Hamano committed Apr 25, 2018 at 13:28 UTC da36be5f08252cdcbfe37710990dea4c4025567a

No changes.