Unit test fails with Python 3.8.1

Running the unit tests with Python 3.8.1 fails with the following error:

=================================== FAILURES ===================================
_____________________________ test_bmp_characters ______________________________

    def test_bmp_characters():
        for index in range(0xa0, 0xfffd):
            char = chr(index)
            # Exclude code points that are not assigned
            if unicodedata.category(char) not in ('Co', 'Cn', 'Cs', 'Mc', 'Mn', 'Sk'):
                garble = char.encode('utf-8').decode('latin-1')
                # Exclude characters whose re-encoding is protected by the
                # 'sequence_weirdness' metric
                if sequence_weirdness(garble) >= 0:
                    garble2 = char.encode('utf-8').decode('latin-1').encode('utf-8').decode('latin-1')
                    for garb in (garble, garble2):
                        fixed, plan = fix_encoding_and_explain(garb)
>                       assert fixed == char
E                       AssertionError: assert 'à±·' == '౷'
E                         - à±·
E                         + ౷

tests/test_characters.py:23: AssertionError
=================== 1 failed, 186 passed, 8 xfailed in 1.84s ===================

Python 3.7.6 does not produce this error.

[rspeer]

Alright, version 5.7 is uploaded.

[rspeer]

Yep, thanks. This is a routine update we have to make to ftfy (to save the character classes from the latest Unicode that Python supports in char_classes.dat).