use argparse on fontbakery-stats-deva-per-day.py
use argparse on fontbakery-stats-deva-per-day.py

(issue #1067)

googlefonts/fontbakery,googlefonts/fontbakery,graphicore/fontbakery,moyogo/fontbakery,moyogo/fontbakery,graphicore/fontbakery,moyogo/fontbakery,graphicore/fontbakery,googlefonts/fontbakery