support custom headers setting
support custom headers setting

zamok2971/GoutteWithMultiCurl,moffe42/Goutte,georaldc/Goutte,zamok2971/GoutteWithMultiCurl,chrismoulton/Goutte,sitesense/Goutte,jozhao/Goutte,2upmedia/Goutte,thewilkybarkid/Goutte,zamok2971/GoutteWithMultiCurl,farhan4648gul/Goutte,trustable/Goutte,ferjflores/Goutte,stof/Goutte,FriendsOfPHP/Goutte,viniciusferreira/Goutte