Add changelog to track changes to the data 
Add changelog to track changes to the data 
vega/vega-lite,jlove29/vega-editor,jlove29/vega-editor,vega/vega-editor,ellisonbg/vega-lite,vega/vega-lite,vega/vega-editor,vega/vega-lite,uwdata/vega-lite,vega/vega-lite,vega/vega-editor,jlove29/vega-editor,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,ellisonbg/vega-lite,uwdata/vega-lite,ellisonbg/vega-lite