add support for rebar3 deps dir
add support for rebar3 deps dir

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