sumo-api.com updates

[thatsumoguy]

As part of developing sumostakes, I added infrastructure for sending webhooks from the sumo-api.

This feature is now accessible to anyone who wants to use it - you can find the details here.

So if you are developing a sumo game or some other service using sumo-api and are currently polling it in order to retrieve data you no longer need to do so. Of course there might still be issues with this service since it is new and I haven't tested it under load. Feel free to subscribe to them and see what happens when the next banzuke is released on 25th December. Feel free to send a DM if you have questions or problems.

In addition, I fixed a couple of bugs and I improved the checking for a new banzuke. Previously I only grabbed the new one on the first day of the month in which a basho would take place, but it now checks the Monday 2 weeks before the basho, so there should be no delays in getting this data any more.