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**WARNING :** This release contains many backwards-incompatible changes.
* Define widget requirements so that users can call
``Form.get_widget_resources()`` to fetch CSS and JavaScript
requirements.
* |backward-incompatible| Add ``strip`` parameter that allows to strip
leading and trailing whitespace on deserialization. As with other
text-like widgets in Deform, this parameter is now enabled by
default. This is why this change is not backward compatible.
* Correctly handle ``delay`` parameter.
* |backward-incompatible| Upgrade to Deform 2 and Pyramid 1.10 compatibility
* |backward-incompatible| Bundle a modern version of jqueryUI and upgrade to support it
* |backward-incompatible| Drop Python 2 support in favour of Python 3