- Mitre has assigned CVE-2019-12290 which was fixed by the roundtrip feature introduced in 2.2.0
- Update the data tables from Unicode 6.3.0 to Unicode 11.0
- Turn _idn2_punycode_encode, _idn2_punycode_decode into compat symbols
Signed-off-by: Pierre-Yves <pyu@riseup.net>