travis: update encrypted PyPI password, remove Github releases deployment
travis: update encrypted PyPI password, remove Github releases deployment

the repository slug has changed from googlei18n to googlefonts, thus the secure environment variables need to be re-encrypted

jamesgk/ufo2fdk,moyogo/ufo2ft,googlei18n/ufo2ft,googlefonts/ufo2ft,jamesgk/ufo2ft