@domoritz removing the unused `encoding.sort`
@domoritz removing the unused `encoding.sort`

uwdata/vega-lite,vega/vega-lite,ellisonbg/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,vega/vega-lite,vega/vega-lite,ellisonbg/vega-lite,ellisonbg/vega-lite