Warnings en starlitos

Aparentemente relacionados con que sean async o no:

```
starlitos_test.py::StarletteTesting::test_should_be_able_to_create_via_post
  /home/jmerelo/.pyenv/versions/3.9.0/lib/python3.9/unittest/case.py:550: RuntimeWarning: coroutine 'StarletteTesting.test_should_be_able_to_create_via_post' was never awaited
```

Cuando se hace `poetry run pytest`