updating dependency versions on requirements.txt
updating dependency versions on requirements.txt

Special note to protobuf version 3.7.0 which includes a fix
for a bug that affected fontbakery (issue #2200)

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