Default to 0 for git rev-list left and right. Fixes #137.
Default to 0 for git rev-list left and right. Fixes #137.

joshuarubin/dotfiles,supercrabtree/pure,enrdstrm/pure,runningskull/pure,forivall/pure,jaredru/zsh-pure,anandubajith/pure,mafredri/pure,dmiedema/pure,depressiveRobot/pure-time,jedahan/pure,ZefQ/pure,sleep/pure,DFurnes/purer,lavelle/pure,mcallan83/pure-plus,alem0lars/pure,kgrz/pure,brandon099/pure,joshuarubin/dotfiles,sindresorhus/pure,btaidm/pure,fvargas/pure,yuya373/pure,kane-c/pure,bramkok/purist,boushley/pure,KarlKode/pure,perks/pure,joshuarubin/dotfiles,joshuarubin/dotfiles