[build/BF] set the correct date format in the changelog
[build/BF] set the correct date format in the changelog

It would have been `date +%Y%m%d`, now it is `date +%Y-%m-%d`.

esc/Psignifit-3.x,esc/Psignifit-3.x,esc/Psignifit-3.x,esc/Psignifit-3.x,esc/Psignifit-3.x,esc/Psignifit-3.x