Formasaurus

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* Dropped official support for Python 3.7 and lower, and added official support
for Python 3.8 and higher.

* Added support for the latest versions of all dependencies, and upgraded
minimum supported versions of dependencies as follows:

* ``docopt``: ``0.4.0``

* ``requests``: ``1.0.0``

* ``tldextract``: ``1.2.0``

* ``with-deps`` extra dependencies:

* ``joblib``: ``1.2.0``

* ``lxml``: ``4.4.1``

* ``lxml-html-clean``: ``0.1.0``

* ``scikit-learn``: ``0.18.0`` → ``0.24.0``

* ``scipy``: ``1.5.1``

* ``sklearn-crfsuite``: ``0.3.1`` → ``0.5.1``

* https://github.com/scrapinghub/formasaurus is the new code repository,
replacing https://github.com/TeamHG-Memex/Formasaurus.

* Updated the CI configuration and development tooling.

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* Support for scikit-learn < 0.18 is dropped;
* Formasaurus is no longer tested with Python 3.3;
* tests are fixed to account for upstream changes; Python 3.6 build is enabled.

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* more annotated data for captchas;
* ``formasaurus init`` command which trains & caches the model.

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* pip bug with ``pip install formasaurus[with-deps]`` is worked around;
it should work now as ``pip install formasaurus[with_deps]``.

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* fixed API documentation at readthedocs.org

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* more annotated data;
* new ``form_classes`` and ``field_classes`` attributes of FormFieldClassifer;
* more robust web page encoding detection in ``formasaurus.utils.download``;
* bug fixes in annotation widgets;