- Update to 3.0.1:
  - Fixed ~fields.DateTimeField and other similar fields can
    handle multiple formats.
  - Fixed ~fields.RadioField validators.
  - ~fields.FormField.populate_obj always calls :func:setattr
  - WTForms has a new logo.
  - Fixed ~fields.RadioField render_kw rendering.
  - Support for optgroups in ~fields.SelectField and
    ~fields.SelectMultipleField.
  - Minor documentation fix.
  - Custom separators for ~fields.FieldList.
  - ~fields.DateTimeField, ~fields.DateField and
    ~fields.TimeField support time formats that removes leading
    zeros.
  - Refactoring: split fields/core.py and fields/simple.py
  - Drop support for Python < 3.6.
  - ~fields.StringField sets data to None when form data is empty
    and an initial value was not provided. Although it previously
    set an empty string, None is consistent with the behavior of
    other fields.
  - Specified version of Babel required for setup to avoid
    errors.
  - Replaced use of getattr/setattr with regular variable access.
  - ValueError raised by a validator are handled like regular
    exceptions. Validators need to raise
    ~validators.ValidationError or ~validators.StopValidation to
    make a validation fail.
  - ~fields.SelectField, ~fields.SelectMultipleField and
    ~fields.RadioField choices parameter can be a callable.
  - Choices shortcut for ~fields.core.SelectMultipleField.
  - Forms can have form-level errors.
  - Implemented ~wtforms.fields.core.MonthField.
  - Filters can be inline. :meth:form.BaseForm.process takes
    a extra_filters parameter.
  - Fields can be passed the name argument to use a HTML name
    different than their Python name.
  - Render attribute names like for_ and class_ are normalized
    consistently so later values override those specified
    earlier.
  - Flags can take non-boolean values.
  - Widgets are HTML5 by default.
  - Fixed a bug when the ~wtforms.fields.core.SelectField choices
    are list of strings.
  - Error messages standardization.
  - ~wtforms.fields.core.SelectMultipleField validate_choice
    bugfix.
  - Fixed SelectMultipleField validation when using choices list
    shortcut.

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