brew.sh: communicate when autoupdate runs for long
brew.sh: communicate when autoupdate runs for long

This will ease user anxiety when `brew install foo' is typed but nothing
seems to happen.

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