doctor: check git version
doctor: check git version

Checking out over HTTP/HTTPS from GitHub requires git 1.6.6, as GitHub
only allows Smart HTTP transport.

Signed-off-by: Jack Nagel <43386ce32af96f5c56f2a88e458cb94cebee3751@gmail.com>

konqui/brew,MikeMcQuaid/brew,sjackman/homebrew,maxim-belkin/brew,DomT4/brew,muellermartin/dist,MikeMcQuaid/brew,EricFromCanada/brew,Linuxbrew/brew,vitorgalvao/brew,Homebrew/brew,reitermarkus/brew,reitermarkus/brew,Linuxbrew/brew,sjackman/homebrew,aw1621107/brew,konqui/brew,vitorgalvao/brew,reitermarkus/brew,mahori/brew,Homebrew/brew,tonyg/homebrew,MikeMcQuaid/brew,claui/brew,staticfloat/brew,tonyg/homebrew,staticfloat/brew,amar-laksh/brew_sudo,Homebrew/brew,nandub/brew,zmwangx/brew,mahori/brew,aw1621107/brew,JCount/brew,mgrimes/brew,tonyg/homebrew,reitermarkus/brew,ilovezfs/brew,ilovezfs/brew,sjackman/homebrew,pseudocody/brew,AnastasiaSulyagina/brew,mistydemeo/homebrew,gregory-nisbet/brew,toonetown/homebrew,muellermartin/dist,Homebrew/brew,EricFromCanada/brew,toonetown/homebrew,aw1621107/brew,claui/brew,mistydemeo/homebrew,nandub/brew,DomT4/brew,konqui/brew,staticfloat/brew,ilovezfs/brew,EricFromCanada/brew,claui/brew,mahori/brew,rwhogg/brew,rwhogg/brew,bfontaine/brew,mgrimes/brew,bfontaine/brew,JCount/brew,JCount/brew,palxex/brew,muellermartin/dist,rwhogg/brew,hanxue/linuxbrew,palxex/brew,AnastasiaSulyagina/brew,vitorgalvao/brew,claui/brew,mahori/brew,sjackman/homebrew,DomT4/brew,palxex/brew,maxim-belkin/brew,amar-laksh/brew_sudo,nandub/brew,Linuxbrew/brew,gregory-nisbet/brew,gordonmcshane/homebrew,nandub/brew,MikeMcQuaid/brew,mistydemeo/homebrew,alyssais/brew,jmsundar/brew,gordonmcshane/homebrew,toonetown/homebrew,JCount/brew,jmsundar/brew,reelsense/brew,gordonmcshane/homebrew,reelsense/brew,bfontaine/brew,alyssais/brew,AnastasiaSulyagina/brew,pseudocody/brew,reelsense/brew,maxim-belkin/brew,hanxue/linuxbrew,alyssais/brew,amar-laksh/brew_sudo,zmwangx/brew,mgrimes/brew,Linuxbrew/brew,DomT4/brew,konqui/brew,jmsundar/brew,vitorgalvao/brew,zmwangx/brew,hanxue/linuxbrew,pseudocody/brew,EricFromCanada/brew,gregory-nisbet/brew