Add hint to upgrade setuptools, referencing #266
Add hint to upgrade setuptools, referencing #266

The fix is nonobvious, and likely belongs in the documentation
somewhere. Figured this would be the best place.

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