make scale.range return so semantic is clearer
make scale.range return so semantic is clearer

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