Scrapinghub-autoextract

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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``

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* add ``--api-endpoint`` option to the command line utility
* improves documentation adding details about ``Request``'s extra parameters

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``autoextract.Request`` helper class now allows to set arbitrary
parameters for AutoExtract requests - they can be passed in ``extra`` argument.

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In this release retry-related features are added or improved.
It is now possible to fix some of the temporary errors
by enabling query-level retries, and the default retry behavior is improved.

* **backwards-incompatible**: autoextract.aio.ApiError is renamed
to autoextract.aio.RequestError
* ``max_query_error_retries`` argument is added to
``autoextract.aio.request_raw`` and
``autoextract.aio.request_parallel_as_completed`` functions; it allows to
enable retries of temporary query-level errors returned by the API.
* CLI: added ``--max-query-error-retries`` option to retry temporary
query-level errors.
* HTTP 500 errors from server are retried now;
* documentation and test improvements.