Failed to send to Slack: error=200

[visch]

2023-08-09T14:46:36.234522Z [info     ] time=2023-08-09 15:46:36 name=apprise level=WARNING message=Failed to send to Slack: error=200. cmd_type=elb consumer=True name=target-apprise producer=False stdio=stderr string_id=target-apprise

The "error" here still sends and apprise succeeds with a 0 exit code so it looks like it's not really "failing"

[visch]

https://github.com/caronc/apprise/blob/master/apprise/Apprise.py#L363-L366

Looks like we could just throw an exception on False / True.

Still doesn't explain the message