chore: update contributing
chore: update contributing

TobiasSchaeuble/HMAD,tommy-boy/AMZNDEALS,subsolo/ITHC,abdolmajidazad/neveshtak,kumarnavinrai/finalmcu,driftyco/ionic-conference-app,tommy-boy/AMZNDEALS,nReality/AgileAfricaConf-app,francarmona/ionice-contryside-events-app,francarmona/ionice-contryside-events-app,nReality/AgileAfricaConf-app,fmsouza/mangiare,nReality/AgileAfricaConf-app,nReality/SUGSA-ScrumGathering-App2016,nReality/AgileAfricaConf-app,nReality/SUGSA-ScrumGathering-App2016,subsolo/ITHC,francarmona/ionice-contryside-events-app,nReality/SUGSA-ScrumGathering-App2016,subsolo/ITHC,fmsouza/mangiare,TobiasSchaeuble/HMAD,ericel/weytindey,pierrecabriere/Greencharge,sinholic/aero-flyer,Beslinda/catalogIonicApp,fmsouza/mangiare,sinholic/aero-flyer,minhlong/NamHoa-Ionic,sinholic/aero-flyer,Beslinda/catalogIonicApp,nReality/AgileAfricaConf-app,nReality/SUGSA-ScrumGathering-App2016,kumarnavinrai/finalmcu,pierrecabriere/Greencharge,Beslinda/catalogIonicApp,fmsouza/mangiare,nReality/SUGSA-ScrumGathering-App2016,abdolmajidazad/neveshtak,driftyco/ionic-conference-app,minhlong/NamHoa-Ionic,nReality/SUGSA-ScrumGathering-App2016,nReality/AgileAfricaConf-app,nReality/SUGSA-ScrumGathering-App2016,kumarnavinrai/finalmcu,pierrecabriere/Greencharge,driftyco/ionic-conference-app,abdolmajidazad/neveshtak,nReality/AgileAfricaConf-app,ericel/weytindey,TobiasSchaeuble/HMAD,minhlong/NamHoa-Ionic,laodice/ionic-conference-app-session2,ericel/weytindey,tommy-boy/AMZNDEALS,laodice/ionic-conference-app-session2,laodice/ionic-conference-app-session2