readme: update example to use sql and work with docker
readme: update example to use sql and work with docker

[ci skip]

petermattis/cockroach,yiixiansheng/cockroach,mbertschler/cockroach,paperstreet/cockroach,jess-edwards/cockroach,yiixiansheng/cockroach,cockroachdb/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,cuongdo/cockroach,linearb/cockroach,petermattis/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,sunya123/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,petermattis/cockroach,sunya123/cockroach,jmank88/cockroach,nieyy/cockroach,nieyy/cockroach,glycerine/cockroach,marcuswestin/cockroach,freakynit/cockroach,il9ue/cockroach,bg451/cockroach,paperstreet/cockroach,jamesgraves/cockroach,linearb/cockroach,vivekmenezes/cockroach,bg451/cockroach,alunarbeach/cockroach,nieyy/cockroach,cockroachdb/cockroach,maxlang/cockroach,maxlang/cockroach,veteranlu/cockroach,il9ue/cockroach,jamesgraves/cockroach,cockroachdb/cockroach,petermattis/cockroach,bg451/cockroach,petermattis/cockroach,sunya123/cockroach,linearb/cockroach,bg451/cockroach,il9ue/cockroach,paperstreet/cockroach,alunarbeach/cockroach,jmank88/cockroach,petermattis/cockroach,cuongdo/cockroach,veteranlu/cockroach,freakynit/cockroach,arjun4084346/cockroach,il9ue/cockroach,sunya123/cockroach,vivekmenezes/cockroach,yiixiansheng/cockroach,GokulSrinivas/cockroach,yiixiansheng/cockroach,paperstreet/cockroach,maxlang/cockroach,bg451/cockroach,jess-edwards/cockroach,mbertschler/cockroach,veteranlu/cockroach,linearb/cockroach,marcuswestin/cockroach,linearb/cockroach,il9ue/cockroach,vivekmenezes/cockroach,jmank88/cockroach,yiixiansheng/cockroach,vaibhavarora/cockroach,il9ue/cockroach,veteranlu/cockroach,vivekmenezes/cockroach,mbertschler/cockroach,maxlang/cockroach,vaibhavarora/cockroach,sunya123/cockroach,vivekmenezes/cockroach,maxlang/cockroach,cuongdo/cockroach,jess-edwards/cockroach,marcuswestin/cockroach,GokulSrinivas/cockroach,cockroachdb/cockroach,jmank88/cockroach,paperstreet/cockroach,marcuswestin/cockroach,mbertschler/cockroach,alunarbeach/cockroach,jamesgraves/cockroach,veteranlu/cockroach,marcuswestin/cockroach,glycerine/cockroach,arjun4084346/cockroach,bg451/cockroach,linearb/cockroach,arjun4084346/cockroach,nieyy/cockroach,freakynit/cockroach,glycerine/cockroach,paperstreet/cockroach,GokulSrinivas/cockroach,linearb/cockroach,jamesgraves/cockroach,bg451/cockroach,paperstreet/cockroach,freakynit/cockroach,cockroachdb/cockroach,glycerine/cockroach,nieyy/cockroach,jmank88/cockroach,freakynit/cockroach,jmank88/cockroach,cuongdo/cockroach,veteranlu/cockroach,marcuswestin/cockroach,cuongdo/cockroach,veteranlu/cockroach,nieyy/cockroach,jmank88/cockroach,alunarbeach/cockroach,nieyy/cockroach,mbertschler/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,maxlang/cockroach,paperstreet/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,glycerine/cockroach,marcuswestin/cockroach,jess-edwards/cockroach,jess-edwards/cockroach,GokulSrinivas/cockroach,il9ue/cockroach,jamesgraves/cockroach,cuongdo/cockroach,vivekmenezes/cockroach,vivekmenezes/cockroach,jamesgraves/cockroach,jamesgraves/cockroach,jess-edwards/cockroach,veteranlu/cockroach,cockroachdb/cockroach,mbertschler/cockroach,il9ue/cockroach,alunarbeach/cockroach,glycerine/cockroach,freakynit/cockroach,cuongdo/cockroach,petermattis/cockroach,vaibhavarora/cockroach,glycerine/cockroach,sunya123/cockroach,GokulSrinivas/cockroach,GokulSrinivas/cockroach,jess-edwards/cockroach,mbertschler/cockroach,marcuswestin/cockroach,cockroachdb/cockroach,yiixiansheng/cockroach,alunarbeach/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,maxlang/cockroach,maxlang/cockroach,glycerine/cockroach,sunya123/cockroach,sunya123/cockroach,cuongdo/cockroach,nieyy/cockroach,petermattis/cockroach