fix issue #220
fix issue #220

min/max length of DESCRIPTION file and check if it's an HTML snippet

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