Use latest Cowboy
Use latest Cowboy

Closes #2725.
0x00evil/phoenix,rafbgarcia/phoenix,dmarkow/phoenix,Gazler/phoenix,0x00evil/phoenix,keathley/phoenix,phoenixframework/phoenix,evax/phoenix,Kosmas/phoenix,dmarkow/phoenix,optikfluffel/phoenix,jwarwick/phoenix,keathley/phoenix,0x00evil/phoenix,stevedomin/phoenix,phoenixframework/phoenix,eksperimental/phoenix,pap/phoenix,rafbgarcia/phoenix,optikfluffel/phoenix,mschae/phoenix,optikfluffel/phoenix,phoenixframework/phoenix,michalmuskala/phoenix,stevedomin/phoenix,evax/phoenix,jwarwick/phoenix,eksperimental/phoenix,nshafer/phoenix,michalmuskala/phoenix,rafbgarcia/phoenix,nshafer/phoenix,Joe-noh/phoenix,Joe-noh/phoenix,mitchellhenke/phoenix,pap/phoenix,Gazler/phoenix,mschae/phoenix,mobileoverlord/phoenix,Kosmas/phoenix,mobileoverlord/phoenix,nshafer/phoenix,mitchellhenke/phoenix