0.3.0: no test suite?

```
+ PYTHONPATH=/home/tkloczko/rpmbuild/BUILD/sphinxcontrib-asyncio-0.3.0
+ /usr/bin/python3 setup.py test --verbose
running test
========================================================================================= test session starts ==========================================================================================
platform linux -- Python 3.8.3, pytest-4.6.9, py-1.8.0, pluggy-0.13.1
hypothesis profile 'default' -> database=DirectoryBasedExampleDatabase('/home/tkloczko/rpmbuild/BUILD/sphinxcontrib-asyncio-0.3.0/.hypothesis/examples')
rootdir: /home/tkloczko/rpmbuild/BUILD/sphinxcontrib-asyncio-0.3.0
plugins: forked-1.1.1, mock-1.10.4, expect-1.1.0, hypothesis-4.23.8, xdist-1.31.0, httpbin-0.3.0, cov-2.8.1, timeout-1.3.4, rerunfailures-8.0, flaky-3.6.1
collected 0 items

===================================================================================== no tests ran in 0.02 seconds =====================================================================================
ERROR: file not found: tests
```