DeprecationWarning on Thread.setDaemon

[wchistow]

When running tests (make test), there is a DeprecationWarning on the setDaemon method (class threading.Thread):

tests/test_browser.py ..                                                                                                                                    [ 33%]
tests/test_events.py ...                                                                                                                                    [ 83%]
tests/test_markdown.py .                                                                                                                                    [100%]

======================================================================== warnings summary =========================================================================
tests/test_events.py::test_message_posted_event_initialization
tests/test_events.py::test_message_edited_event_initialization
tests/test_events.py::test_message_starred_event_initialization
  /.../ChatExchange/chatexchange/client.py:101: DeprecationWarning: setDaemon() is deprecated, set the daemon attribute instead
    self._thread.setDaemon(True)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
================================================================== 6 passed, 3 warnings in 0.58s ==================================================================

It is better to use thread.daemon = True instead of thread.setDaemon(True).

Note: the daemon attribute was added in Python 2.6

PR: #183

[wchistow]

The pull request was merged, so I'm closing this issue.