Deprecation warning for asyncio.get_event_loop()

[rrawlins]

When using the tool via vscode, I'm seeing the following deprecation warning:

C:\Users\1G0570897\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\tnz\tnz.py:3790: DeprecationWarning: There is no current event loop
    loop = asyncio.get_event_loop()

Documenting here as an FYI.

[najohnsn]

With #71, use of Ati will no longer result in this deprecation warning. There are still cases where you may see it when using Tnz directly - but some of those warning are going away in newer versions of Python and in those newer versions the warning can be prevented if the user specifically sets the current event loop.