remove outdated comment regarding #131.  (This is automatically fixed when we migrate to vega 2)
remove outdated comment regarding #131.  (This is automatically fixed when we migrate to vega 2)

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