Updated COPYING to include contributor head-nod.
Updated COPYING to include contributor head-nod.

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