Log Message:
py-ZopeSchema: updated to 6.0.0

6.0.0:
Require zope.interface 5.0.
Ensure the resolution orders of all fields are consistent and make sense. In \ 
particular, Bool fields now correctly implement IBool before IFromUnicode.
Add support for Python 3.8.
Drop support for Python 3.4.

5.0.1:
Fix: add Text.unicode_normalization = 'NFC' as default, because some are \ 
persisting schema fields. Setting that attribute only in __init__ breaks loading \ 
old objects.

5.0:
Set IDecimal attributes min, max and default as Decimal type instead of Number.
Enable unicode normalization for Text fields. The default is NFC normalization. \ 
Valid forms are ‘NFC’, ‘NFKC’, ‘NFD’, and ‘NFKD’. To disable \ 
normalization, set unicode_normalization to False or None when calling __init__ \ 
of the Text field.