Update CONTRIBUTING.md
Update CONTRIBUTING.md

Done some adjustments
ratrun/graphhopper,don-philipe/graphhopper,tobias74/graphhopper,fbonzon/graphhopper,PGWelch/graphhopper,seeebiii/graphhopper,prembasumatary/graphhopper,prembasumatary/graphhopper,komoot/graphhopper,komoot/graphhopper,boldtrn/graphhopper,devemux86/graphhopper,tobias74/graphhopper,ratrun/graphhopper,tobias74/graphhopper,ratrun/graphhopper,CEPFU/graphhopper,prembasumatary/graphhopper,seeebiii/graphhopper,hguerrero/graphhopper,joh12041/graphhopper,ammagamma/graphhopper,boldtrn/graphhopper,ratrun/graphhopper,hguerrero/graphhopper,CEPFU/graphhopper,devemux86/graphhopper,routexl/graphhopper,don-philipe/graphhopper,joh12041/graphhopper,hguerrero/graphhopper,seeebiii/graphhopper,PGWelch/graphhopper,bendavidson/graphhopper,ammagamma/graphhopper,tobias74/graphhopper,devemux86/graphhopper,joh12041/graphhopper,bendavidson/graphhopper,fbonzon/graphhopper,seeebiii/graphhopper,bendavidson/graphhopper,graphhopper/graphhopper,ammagamma/graphhopper,fbonzon/graphhopper,devemux86/graphhopper,CEPFU/graphhopper,ammagamma/graphhopper,boldtrn/graphhopper,PGWelch/graphhopper,prembasumatary/graphhopper,routexl/graphhopper,joh12041/graphhopper,graphhopper/graphhopper,routexl/graphhopper,don-philipe/graphhopper,boldtrn/graphhopper,komoot/graphhopper,graphhopper/graphhopper,komoot/graphhopper,graphhopper/graphhopper,fbonzon/graphhopper,CEPFU/graphhopper,don-philipe/graphhopper,routexl/graphhopper,bendavidson/graphhopper,PGWelch/graphhopper,hguerrero/graphhopper