Add upgrade --all flag to bash completion script
Add upgrade --all flag to bash completion script

Closes Homebrew/homebrew#39359.

Signed-off-by: Jack Nagel <43386ce32af96f5c56f2a88e458cb94cebee3751@gmail.com>

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