Version 0.3.0-alpha.9.1: Live in Disgrace, Done Dirty

This is a hotfix to v0.3.0-alpha.9 (which is the latest working
release; the later releases have issues serious enough to make them
unusable at all) for those who need to keep the bots operational under
the new access tiers for Twitter API.

The release only supports Tweeting WebSub entries via the write-only
Free tier access, meaning that it cannot fetch Tweets nor Retweet them.

Support for the Basic+ tiers is not planned, partly because API v2 lacks
important features (e.g. GET /2/lists/:id/tweets does not have an
equivalent of the since_id parameter, required for keeping the Tweet
cap usage optimal. There is a related topic on Twitter Developers
community, which unsurprisingly remains neglected), and most
importantly, I have lost the enthusiasm for the platform after all the
dramas. Now, I even find myself feeling indignified writing code for the
platform. Let alone paying $100/mo. for it.

This is intended to be a dirty hotfix made just to keep existing bots
operating for the time being. I hope there will be a proper release from
the main branch, fixing all the issues and maybe completely removing the
Twitter inbox support. However, the project is now undergoing a major
refactoring process and that release may not be very soon.