Only run migration when updating from older version.
Only run migration when updating from older version.

Homebrew/brew,reitermarkus/brew,DomT4/brew,MikeMcQuaid/brew,reitermarkus/brew,nandub/brew,MikeMcQuaid/brew,sjackman/homebrew,Homebrew/brew,mahori/brew,mahori/brew,mahori/brew,claui/brew,nandub/brew,Homebrew/brew,JCount/brew,Linuxbrew/brew,nandub/brew,maxim-belkin/brew,konqui/brew,vitorgalvao/brew,reitermarkus/brew,maxim-belkin/brew,JCount/brew,MikeMcQuaid/brew,vitorgalvao/brew,Linuxbrew/brew,MikeMcQuaid/brew,Linuxbrew/brew,Homebrew/brew,EricFromCanada/brew,JCount/brew,EricFromCanada/brew,vitorgalvao/brew,konqui/brew,konqui/brew,claui/brew,mahori/brew,vitorgalvao/brew,nandub/brew,sjackman/homebrew,sjackman/homebrew,DomT4/brew,konqui/brew,JCount/brew,EricFromCanada/brew,claui/brew,Linuxbrew/brew,claui/brew,sjackman/homebrew,DomT4/brew,reitermarkus/brew,DomT4/brew,maxim-belkin/brew,EricFromCanada/brew