Use sha1 as the default checksum for new formulae
Use sha1 as the default checksum for new formulae

See: https://github.com/mxcl/homebrew/pull/12587

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