Request support for PATCH method

[stevenwbuehler]

I'm running a camera on a Twitch channel, which requires that channel updates be sent via a PATCH request. It doesn't appear to be supported in this application.

[derekantrican]

@stevenwbuehler I have recently taken over this plugin. If this is still an issue you are facing and a feature you need, please resubmit an issue at https://github.com/derekantrican/OctoPrint-Webhooks/issues