add migrator class for migrating renamed formulae
add migrator class for migrating renamed formulae

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