update-report: add newline if preinstall updated.
update-report: add newline if preinstall updated.

Fixes #858.

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