fix bug of csvtojson cli does not exit when using pipe
fix bug of csvtojson cli does not exit when using pipe

danucalovj/node-csvtojson,Keyang/node-csvtojson,jishnu7/node-csvtojson,studiowangfei/node-csvtojson,Keyang/node-csvtojson,pandeysoni/node-csvtojson