roachpb: remove outdated README
roachpb: remove outdated README

maxlang/cockroach,veteranlu/cockroach,cockroachdb/cockroach,glycerine/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,arjun4084346/cockroach,sunya123/cockroach,paperstreet/cockroach,maxlang/cockroach,paperstreet/cockroach,maxlang/cockroach,veteranlu/cockroach,vivekmenezes/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,sunya123/cockroach,vivekmenezes/cockroach,petermattis/cockroach,petermattis/cockroach,glycerine/cockroach,cockroachdb/cockroach,cockroachdb/cockroach,petermattis/cockroach,sunya123/cockroach,glycerine/cockroach,paperstreet/cockroach,glycerine/cockroach,paperstreet/cockroach,petermattis/cockroach,maxlang/cockroach,petermattis/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,cockroachdb/cockroach,veteranlu/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,sunya123/cockroach,vaibhavarora/cockroach,glycerine/cockroach,veteranlu/cockroach,veteranlu/cockroach,maxlang/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,arjun4084346/cockroach,glycerine/cockroach,paperstreet/cockroach,vivekmenezes/cockroach,maxlang/cockroach,veteranlu/cockroach,sunya123/cockroach,glycerine/cockroach,arjun4084346/cockroach,petermattis/cockroach,vaibhavarora/cockroach,sunya123/cockroach,arjun4084346/cockroach,sunya123/cockroach,cockroachdb/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,sunya123/cockroach,petermattis/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,glycerine/cockroach,cockroachdb/cockroach,maxlang/cockroach,vaibhavarora/cockroach,maxlang/cockroach,petermattis/cockroach,veteranlu/cockroach