bump Homebrew version to 0.9.8
bump Homebrew version to 0.9.8

So we can know whether a Homebrew installation is pre or post
core/formula separation.

Will update to 0.9.9 when moving core code to new repo.

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