spacemanspiff2007

I tried to add it but I am not fully sure if everything is in the right place ... . I'm not sure if allowing `None` for client.messages is a...

For me this is not an [issue](https://github.com/spacemanspiff2007/HABApp/blob/5ccb2d6f69e7917a766cac60ac25db5afa2919e6/src/HABApp/mqtt/connection/handler.py#L71) because I'm using a workaround. However I think `Client.messages()` makes more sense than `Client.messages`. The only graceful migration I see is to rename...

Imho ``.messages()`` makes more sense because it aligns e.g. with ``dict.keys()``. If you prefer ``.messages`` then a proper type hint should be supplied. That's difficult because you can fall back...