Update CHANGELOG format
Update CHANGELOG format

CarnegieLearningWeb/chef-postfix,leoditommaso/postfix,voroniys/postfix,Lostmyname/postfix,interactive-investor-ltd/postfix,interactive-investor-ltd/postfix,Maks3w/postfix,zuazo-forks/chef-cookbooks-postfix,mlyndaker/postfix,opscode-cookbooks/postfix,Koded/postfix,petere/postfix,opscode-cookbooks/postfix,rackspace-cookbooks/rackspace_postfix,ianneub/postfix,tejaycar/postfix,chef-cookbooks/postfix,tas50/postfix,yakara-ltd/postfix,mawatech/postfix,brint/postfix,VertiPub/postfix,chrisjbray/postfix,voroniys/postfix,nilroy/postfix,heat-cookbooks/postfix,mlyndaker/postfix,rafaelmagu/postfix,harmdewit/postfix,yakara-ltd/postfix,mawatech/postfix,tcroiset/postfix,elliotkendallUCSF/postfix,nilroy/postfix,chef-cookbooks/postfix,zuazo-forks/chef-cookbooks-postfix,Lostmyname/postfix,leoditommaso/postfix,i11/postfix,gnowxilef/cookbook-postfix,tezz123/postfix,gnowxilef/cookbook-postfix,chrisjbray/postfix,heat-cookbooks/postfix,CarnegieLearningWeb/chef-postfix