cask upgrade: add message about `auto_updates` and `:latest`
cask upgrade: add message about `auto_updates` and `:latest`

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