Added csvstack to setup.py scripts list.
Added csvstack to setup.py scripts list.

onyxfish/csvkit,moradology/csvkit,Tabea-K/csvkit,matterker/csvkit,arowla/csvkit,kyeoh/csvkit,nriyer/csvkit,Jobava/csvkit,dannguyen/csvkit,cypreess/csvkit,haginara/csvkit,barentsen/csvkit,tlevine/csvkit,doganmeh/csvkit,elcritch/csvkit,jpalvarezf/csvkit,unpingco/csvkit,bradparks/csvkit__query_join_filter_CSV_cli,wireservice/csvkit,bmispelon/csvkit,metasoarous/csvkit,themiurgo/csvkit,KarrieK/csvkit,wjr1985/csvkit,snuggles08/csvkit,gepuro/csvkit,aequitas/csvkit,reubano/csvkit,archaeogeek/csvkit