Update README

README.rst

@@ -256,6 +256,13 @@ or an async framework such as `asynctest <https://asynctest.readthedocs.io/en/la
 
 Changelog
 ---------
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+0.17.2 (22-01-17)
+~~~~~~~~~~~~~~~~~~~
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+- Require ``typing-extensions`` on Python<3.8 only. `#269 <https://github.com/pytest-dev/pytest-asyncio/issues/269>`_
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+
 0.17.1 (22-01-16)
 ~~~~~~~~~~~~~~~~~~~
 - Fixes a bug that prevents async Hypothesis tests from working without explicit ``asyncio`` marker when ``--asyncio-mode=auto`` is set. `#258 <https://github.com/pytest-dev/pytest-asyncio/issues/258>`_