Update ISSUE_TEMPLATE.md
Update ISSUE_TEMPLATE.md

Make it much briefer
vega/vega-lite,vega/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,uwdata/vega-lite