Switched `Content-Type` header to `Accept` header in README example.
Switched `Content-Type` header to `Accept` header in README example.

meteochu/Alamofire,jschmid/Alamofire,mbhuta/Alamofire,richardPFisk/Alamofire,agustindc-rga/Alamofire,Vkt0r/Alamofire,richardPFisk/Alamofire,Alamofire/Alamofire,gauravds/Alamofire,gauravds/Alamofire,iosheadhunter/Alamofire,easyui/Alamofire,tonyli508/AlamofireDomain,Noobish1/Alamofire,agustindc-rga/Alamofire,Koalappp/Alamofire,Farteen/Alamofire,Vkt0r/Alamofire,Alamofire/Alamofire,iosheadhunter/Alamofire,Holmusk/Alamofire,antigp/Alamofire,yimajo/Alamofire,antigp/Alamofire,Lomotif/Alamofire,twobitlabs/Alamofire,DouKing/Alamofire,kiancheong/Alamofire,tonyli508/AlamofireDomain,kiancheong/Alamofire,twobitlabs/Alamofire,easyui/Alamofire,meteochu/Alamofire,DouKing/Alamofire,Koalappp/Alamofire,Noobish1/Alamofire,Lomotif/Alamofire,dgdosen/Alamofire,Farteen/Alamofire,dgdosen/Alamofire,jschmid/Alamofire,mbhuta/Alamofire,Holmusk/Alamofire,Holmusk/Alamofire,yimajo/Alamofire