boneyard-formula-pr: use ohai to print messages
boneyard-formula-pr: use ohai to print messages

Make its behavior more consistent with that of bump-formula-pr.

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