fetch: use concat rather than << and flatten
fetch: use concat rather than << and flatten

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