add dmg cookbook requirement to metadata
add dmg cookbook requirement to metadata

vinyar/git,deepak/chef-cookbook-git,cookbooks/hw-git,Nordstrom/git,hughsaunders/git,joncotton/git,jssjr/git,edmunds-chef/git,cookbooks/oc-git,vinyar/git,jtimberman/git,h4ck3rm1k3/git,jssjr/git,veered/git,tas50/git,andyt/git,chef-cookbooks/git,brodock/git,heathsnow/git,lostintime/chef-git,vinyar/git,jssjr/git,heathsnow/git,optimizely/git,protec-cookbooks/git,h4ck3rm1k3/git,protec-cookbooks/git,rapid7-cookbooks/git,edmunds-chef/git,myabc/git,krobertson/chef-git,h4ck3rm1k3/git,heathsnow/git,protec-cookbooks/git,MarcinCebula/git,optimizely/git,grozen/git,edmunds-chef/git,glensc/chef-cookbook-git,optimizely/git,chef-cookbooks/git,pghalliday-cookbooks/git,fheng/git,JoeyJiao/git