added version question to issue_template.md
added version question to issue_template.md

CDLUC3/dmptool,DMPRoadmap/roadmap,DigitalCurationCentre/roadmap,DMPRoadmap/roadmap,DigitalCurationCentre/roadmap,DMPRoadmap/roadmap,CDLUC3/dmptool,DigitalCurationCentre/roadmap,CDLUC3/dmptool,CDLUC3/dmptool