Zyte-autoextract

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* --disable-cert-validation option to disable TSL certificates validation.

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Update to accommodate upstream rebranding changes, as Scrapinghub has become
Zyte.

This update involves some major changes:

- The repository name and the package name in the Python Package Index have
changed from ``scrapinghub-autoextract`` to ``zyte-autoextract``.

- The ``SCRAPINGHUB_AUTOEXTRACT_KEY`` environment variable has been renamed
to ``ZYTE_AUTOEXTRACT_KEY``.

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* fixed ``max_retries`` behaviour. Total attempts must be max_retries + 1

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* CLI changes: error display in the progress bar is changed;
summary is printed after the executions
* more errors are retried when retrying is enabled, which allows for a higher
success rate
* fixed tcp connection pooling
* ``autoextract.aio.request_raw`` function allows to pass custom headers
to the API (not to remote websites)
* ``autoextract.aio.request_raw`` now allows to customize the retry
behavior, via ``retrying`` argument
* ``tenacity.RetryError`` is no longer raised by the library; concrete errors
are raised instead
* Python 3.9 support
* CI is moved from Travis to Github Actions

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* ``QueryError`` is renamed to ``_QueryError``, as this is not an error
users of the library ever see.
* Retrials were broken by having userAgent in the userQuery API output;
temporary workaround is added to make retrials work again.

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* fix a problem that was preventing calls to ``request_raw`` when ``endpoint`` argument was ``None``