Update Pathname version checks.
Update Pathname version checks.

* allow capital 'RC'
* allow 'stable' suffix

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