update readme with docker instructions
update readme with docker instructions

donnanicolas/elastigo,mikeyoon/elastigo,mikeyoon/elastigo,barnslig/elastigo,dimroc/elastigo,triptec/elastigo,chzyer-dev/elastigo,allgeek/elastigo,slavau/elastigo,allgeek/elastigo,barnslig/elastigo,zaphod-concur/elastigo,lytics/elastigo,weberr13/elastigo,acsellers/elastigo,dimroc/elastigo,jiangjin/elastigo,mikeyoon/elastigo,slavau/elastigo,triptec/elastigo,origami/elastigo,sammi/elastigo,PuerkitoBio/elastigo,mattbaird/elastigo,sammi/elastigo,chzyer-dev/elastigo,zaphod-concur/elastigo,zaphod-concur/elastigo,ramin/elastigo,Kaidence/elastigo,origami/elastigo,snikch/elastigo,acsellers/elastigo,donnanicolas/elastigo,origami/elastigo,allgeek/elastigo,weberr13/elastigo,barnslig/elastigo,acsellers/elastigo,snikch/elastigo,PuerkitoBio/elastigo,chzyer-dev/elastigo,triptec/elastigo,slavau/elastigo,mattbaird/elastigo,splicers/elastigo,dimroc/elastigo,sammi/elastigo,otiai10/elastigo,jiangjin/elastigo,otiai10/elastigo,otiai10/elastigo,splicers/elastigo,ramin/elastigo,lytics/elastigo,ramin/elastigo,weberr13/elastigo,mattbaird/elastigo,jiangjin/elastigo,splicers/elastigo,PuerkitoBio/elastigo,donnanicolas/elastigo,Kaidence/elastigo,snikch/elastigo,lytics/elastigo,Kaidence/elastigo