Mention IsolatedAsyncioTestCase

Author: nicoddemus

README.rst

@@ -166,7 +166,8 @@ Note about unittest
 -------------------
 
 Test classes subclassing the standard `unittest <https://docs.python.org/3/library/unittest.html>`__ library are not supported, users
-are recommended to use one of the async frameworks available for that such as `asynctest <https://asynctest.readthedocs.io/en/latest>`__.
+are recommended to use `unitest.IsolatedAsyncioTestCase <https://docs.python.org/3/library/unittest.html#unittest.IsolatedAsyncioTestCase>`__ 
+or an async framework such as `asynctest <https://asynctest.readthedocs.io/en/latest>`__.
 
 Changelog
 ---------