uses.rb: Pass a block to map instead of a Proc
uses.rb: Pass a block to map instead of a Proc

Passing a `Proc` doesn't work in Ruby 1.8.6 which causes `brew uses` to fail on
Leopard.

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