Min pytest-asyncio of 0.17

So that the asyncio_mode in pytest.ini does not produce
a warning on older versions of that library.

setup.py

@@ -69,7 +69,7 @@ setup(
         "test": [
             "pytest>=5.2.2,<7.1.0",
             "pytest-xdist>=2.2.1,<2.6",
-            "pytest-asyncio>=0.10,<0.19",
+            "pytest-asyncio>=0.17,<0.19",
             "beautifulsoup4>=4.8.1,<4.11.0",
             "black==22.1.0",
             "pytest-timeout>=1.4.2,<2.2",