Update wtforms to 2.2.1

[pyup-bot]

This PR updates WTForms from 2.1 to 2.2.1.

Changelog

2.2

-----------

Released June 2nd, 2018

-   Merged new and updated translations from the community.
-   Passing ``data_`` args to render a field converts all the
 underscores to hyphens when rendering the HTML attribute, not just
 the first one. ``data_foo_bar`` becomes ``data-foo-bar``. (`248`_)
-   The :class:`~validators.UUID` validator uses the :class:`uuid.UUID`
 class instead of a regex. (`251`_)
-   :class:`~fields.SelectField` copies the list of ``choices`` passed
 to it so modifying an instance's choices will not modify the global
 form definition. (`286`_)
-   Fields call :meth:`~fields.Field.process_formdata` even if the raw
 data is empty. This makes :class:`~fields.StringField` default to an
 empty string instead of ``None``. (`280`_)
-   Added a :class:`~fields.MultipleFileField` to handle a multi-file
 input. :class:`~fields.FileField` continues to handle only one
 value. The underlying :class:`~widgets.FileInput` widget gained a
 ``multiple`` argument. (`281`_)
-   :class:`~fields.SelectField` choices can contain HTML (MarkupSafe
 ``Markup`` object or equivalent API) and will be rendered properly.
 (`302`_)
-   :class:`~fields.TimeField` and
 :class:`html5.TimeField <fields.html5.TimeField>` were added.
 (`254`_)
-   Improved :class:`~validators.Email`. Note that it is still
 unreasonable to validate all emails with a regex and you should
 prefer validating by actually sending an email. (`294`_)
-   Widgets render the ``required`` attribute when using a validator
 that provides the ``'required'`` flag, such as
 :class:`~validators.DataRequired`. (`361`_)
-   Fix a compatibility issue with SQLAlchemy 2.1 that caused
 :class:`~ext.sqlalchemy.fields.QuerySelectField` to fail with
 ``ValueError: too many values to unpack``. (`391`_)

.. _248: https://github.com/wtforms/wtforms/pull/248
.. _251: https://github.com/wtforms/wtforms/pull/251
.. _254: https://github.com/wtforms/wtforms/pull/254
.. _280: https://github.com/wtforms/wtforms/pull/280
.. _281: https://github.com/wtforms/wtforms/pull/281
.. _286: https://github.com/wtforms/wtforms/pull/286
.. _294: https://github.com/wtforms/wtforms/pull/294
.. _302: https://github.com/wtforms/wtforms/pull/302
.. _361: https://github.com/wtforms/wtforms/pull/361
.. _391: https://github.com/wtforms/wtforms/pull/391

Links

• PyPI: https://pypi.org/project/wtforms
• Changelog: https://pyup.io/changelogs/wtforms/
• Docs: https://wtforms.readthedocs.io/

[pyup-bot]

Closing this in favor of #66