Merge pull request #302 from Niccolum/main

add 3.7 support for async_stub

src/pytest_mock/plugin.py

@@ -173,7 +173,7 @@ def async_stub(self, name: Optional[str] = None) -> AsyncMockType:
         :return: Stub object.
         """
         return cast(
-            unittest.mock.AsyncMock,
+            AsyncMockType,
             self.mock_module.AsyncMock(spec=lambda *args, **kwargs: None, name=name),
         )