Scrapy-poet

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* :ref:`scrapy-poet stats <stats>` now also include counters for injected
dependencies (``poet/injector/<dependency import path>``).

* All scrapy-poet stats that used to be prefixed with ``scrapy-poet/`` are now
prefixed with ``poet/`` instead.

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* Now requires ``web-poet >= 0.15.0``.

* :external+web-poet:ref:`Web-poet stats <stats>` are now :ref:`supported
<stats>`.

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* Python 3.7 support has been dropped.

* Caching is now built on top of web-poet serialization, extending caching
support to additional inputs, while making our code simpler, more reliable,
and more future-proof.

This has resulted in a few backward-incompatible changes:

* The ``scrapy_poet.page_input_providers.CacheDataProviderMixin`` mixin class
has been removed. Providers no longer need to use it or reimplement its
methods.

* The ``SCRAPY_POET_CACHE_GZIP`` setting has been removed.

* Added ``scrapy_poet.utils.open_in_browser``, an alternative to
``scrapy.utils.response.open_in_browser`` that supports scrapy-poet.

* Fixed some documentation links.

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* Now requires ``web-poet >= 0.12.0``.

* The ``scrapy savefixture`` command now uses the adapter from the
``SCRAPY_POET_TESTS_ADAPTER`` setting to save the fixture.

* Fix a typo in the docs.

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* Now requires ``web-poet >= 0.11.0``.

* The ``scrapy savefixture`` command can now generate tests that expect that
``to_item()`` raises a specific exception (only
:class:`web_poet.exceptions.PageObjectAction` and its descendants are
expected).

* Fixed an error when using ``scrapy shell`` with
:class:`scrapy_poet.InjectionMiddleware` enabled.

* Add a ``twine check`` CI check.

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* The ``scrapy savefixture`` command can now generate a fixture :ref:`using an
existing spider <fixture-spiders>`.