Update wtforms to 2.3.1

[pyup-bot]

This PR updates WTForms from 2.1 to 2.3.1.

Changelog

2.3.0

-------------

Released 2020-04-21

-   Drop support for Python 2.6, 3.3, and 3.4.
-   :class:`~fields.SelectField` uses ``list()`` to construct a new list
 of choices. :pr:`475`
-   Permitted underscores in ``HostnameValidation``. :pr:`463`
-   :class:`~validators.URL` validator now allows query parameters in
 the URL. :issue:`523`, :pr:`524`
-   Updated ``false_values`` param in ``BooleanField`` docs.
 :issue:`483`, :pr:`485`
-   Fixed broken format string in Arabic translation :pr:`471`
-   Updated French and Japanese translations. :pr:`506, 514`
-   Updated Ukrainian translation. :pr:`433`
-   ``FieldList`` error list keeps entries in order for easier
 identification of which fields had errors. :issue:`257`, :pr:`407`
-   :class:`~validators.Length` gives a more helpful error message when
 ``min`` and ``max`` are the same value. :pr:`266`
-   :class:`~fields.SelectField` no longer coerces ``None`` to
 ``"None"`` allowing use of ``"None"`` as an option. :issue:`289`,
 :pr:`288`
-   The :class:`~widgets.TextArea` widget prepends a ``\r\n`` newline
 when rendering to account for browsers stripping an initial line for
 display. This does not affect the value. :issue:`238`, :pr:`395`
-   HTML5 :class:`~fields.html5.IntegerField` and
 :class:`~fields.html5.RangeInput` don't render the ``step="1"``
 attribute by default. :pr:`343`
-   ``aria_`` args are rendered the same way as ``data_`` args, by
 converting underscores to hyphens. ``aria_describedby="name-help"``
 becomes ``aria-describedby="name-help"``. :issue:`239`, :pr:`389`
-   Added a ``check_validators`` method to :class:`~fields.Field` which
 checks if the given validators are both callable, and not classes.
 :pr:`298, 410`
-   ``form.errors`` is not cached and will update if an error is
 appended to a field after access. :pr:`568`
-   :class:`~wtforms.validators.NumberRange` correctly handle NaN
 values. :issue:`505`, :pr:`548`
-   :class:`~fields.IntegerField` checks input type when processing
 data. :pr:`451`
-   Added a parameter to :class:`~fields.SelectField` to skip choice
 validation. :issue:`434`, :pr:`493`
-   Choices which name and data are the same do not need to use tuples.
 :pr:`526`
-   Added more documentation on HTML5 fields. :pr:`326, 409`
-   HTML is escaped using MarkupSafe instead of the previous internal
 implementation. :func:`~widgets.core.escape_html` is removed,
 replaced by :func:`markupsafe.escape`.
 :class:`~widgets.core.HTMLString` is removed, replaced by
 :class:`markupsafe.Markup`. :pr:`400`
-   Fixed broken IPv6 validator, validation now uses the ``ipaddress``
 package. :issue:`385`, :pr:`403`
-   :class:`~fields.core.Label` text is escaped before rendering.
 :issue:`315`, :pr:`375`
-   Email validation is now handled by an optional library,
 ``email_validator``. :pr:`429`

2.2.1

-------------

Released 2018-06-07

-   :class:`~fields.StringField` only sets ``data = ''`` when form data
 is empty and an initial value was not provided. This fixes an issue
 where the default value wasn't rendered with the initial form.
 :issue:`291, 401`, :pr:`355`

2.2

-----------

Released 2018-06-02

-   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``. :pr:`248`
-   The :class:`~validators.UUID` validator uses the :class:`uuid.UUID`
 class instead of a regex. :pr:`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. :pr:`286`
-   Fields call :meth:`~fields.Field.process_formdata` even if the raw
 data is empty. :pr:`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. :pr:`281`
-   :class:`~fields.SelectField` choices can contain HTML (MarkupSafe
 ``Markup`` object or equivalent API) and will be rendered properly.
 :pr:`302`
-   ``fields.TimeField`` and ``html5.TimeField`` were added. :pr:`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. :pr:`294`
-   Widgets render the ``required`` attribute when using a validator
 that provides the ``'required'`` flag, such as
 :class:`~validators.DataRequired`. :pr:`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``. :pr:`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 #73