fix _parse_column_names bug introduced with change to object-orientation
fix _parse_column_names bug introduced with change to object-orientation

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