Fix brew list completion and add support for --versions switch
Fix brew list completion and add support for --versions switch

Signed-off-by: Adam Vandenberg <34c2b6407fd5a10249a15d699d40f9ed1782e98c@gmail.com>

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