tweak readme
tweak readme

jaredlander/GraphConvert,supersambo/sigma,etheleon/sigma,jjallaire/sigma,etheleon/sigma,jaredlander/sigma,ramnathv/sigma,paulgovan/sigma,paulgovan/sigma,iankloo/sigma,ramnathv/sigma,supersambo/sigma,jjallaire/sigma,jaredlander/sigma,iankloo/sigma