#19 deprecation warning for imp

[Andrew Erickson]

====================================================================================== warnings summary =======================================================================================
swagger_server/test/test_default_controller.py::TestDefaultController::test_lps_get
  /Users/aje/git/python_hue/.venv/lib/python3.9/site-packages/yapsy/PluginManager.py:134: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
    import imp

-- Docs: https://docs.pytest.org/en/stable/warnings.html