Update to use official 17.0 release for Travis
Update to use official 17.0 release for Travis

lrascao/relx,timclassic/relx,ingwinlu/relx,bitwalker/relx,bsmr-erlang/relx,Licenser/relx,syl20bnr/relx,RJ/relx,erlware/relx,umatomba/relx,ethercrow/relx,zugolosian/relx,tsloughter/relx,priestjim/relx