py-country: updated to 19.8.18

19.8.18:
- Fix installation on systems that don't have UTF-8
  as default encoding.
- Remove superfluous print debugging output.

19.7.15:
- Update to iso-codes 4.3.
- Add support for ISO 639-5 (Language Families and Groups).
- Drop support for Python 2.
- Add `search_fuzzy()` function to the countries database. This allows
  for dealing with user searches that aren't really aware of ISO 3166 (so,
  like, actual human beings). A bit of character normalization and prioritizing
  matches between multiple criteria allows building somewhat reasonable
  suggestion/autocompletion lists.
  Caveat emptor: no attention has been paid to performance in this feature.

(adam)