Tests fail in Python 3.7

[declension]

Steps

• Run poetry run pytest

Expected

Tests pass

Actual

Many failures:

• mainly due to stricter validation for SSL calls (ValueError etc)
• Also, this: TypeError: a coroutine was expected, got <Task pending coro=<BrokerThread.run_loop() running at /usr/local/src/squeeze-alexa/tests/transport/mqtt_integration_test.py:88>>