- update to version 4.9.3
4.5.0:
* Add support for Python 3.5 and 3.6.
* Drop support for Python 2.6, 3.2, and 3.3.
* Drop support for ‘setup.py test’. Use zope.testrunner instead.
4.6.0
* Add support for Python 3.7.
* Choice, SimpleVocabulary and SimpleTerm all gracefully handle
using Unicode token values with non-ASCII characters by encoding
them with the backslashreplace error handler.
* Add fields and interfaces representing Python’s numeric tower.
* More various enhancements.
4.6.1
* Fix the Field constructor to again allow MessageID values for
the description.
4.6.2
* Fix checking a field’s constraint to set the field and value
properties if the constraint raises a ValidationError.
4.7.0
* Give various classes some fields.
4.8.0
* Fix passing None as the description to a field constructor.
4.9.0
* Make NativeString and NativeStringLine distinct types.
* Fix Field.getDoc() when value_type or key_type is present.
* Make DottedName accept leading underscores for each segment.
4.9.1
* Fix SimpleTerm token for non-ASCII bytes values.
4.9.2
* Make sure that the title for IObject.validate_invariants is a