Change Readme to clearly point out that the project is not worked on any more.

[WolfgangFahl]

#161 starts being a showstopper for python 3.11 and if no new maintainers step in this project is not useable any more soon. #158 already asked the question and @Martiusweb Martin Richard's answer was straightforward I'll not work on asynctest anymore, and I believe unittest.mock.AsyncMock in combination with pytest is probably your best bet for now.

IMHO this should be stated as one of the first sentences in the README

[misuzu]

unittest.IsolatedAsyncioTestCase is basically a drop-in replacement

[WolfgangFahl]

@misuzu that is a very helpful hint.

[WolfgangFahl]

https://github.com/justpy-org/justpy/commit/2db41e0389c2e2278839e8cbcc3b671e02d917a0 shows the kind of necessary refactoring