Django-tapeforms

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* Add support for Django 3

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* Add support for Python 3.7 and 3.8
* Remove support for Django 2.0 and 2.1
* Fix duplicated class issue in bootstrap template

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* Change the way extra options are applied to invalid widgets

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* Add support for Foundation flavored forms
* Improve support for applying css classes to invalid fields

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* Fix styling of invalid inputs in Bootstrap forms by adding the correct css class

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* Add ``as_tapeform`` method to Forms to render forms without the need to call
the ``form`` template tag
* Add hook to update widget options ``apply_widget_options``
* DateInput, TimeInput and SplitDateTimeWidget get a proper input type to
activate Browser's datepicker.
* Fix invalid help text display if html tags are part of the help text