Support Mastodon 2.6 bidirectional pagination API

See https://github.com/tootsuite/mastodon/releases/tag/v2.6.0

The new pagination param min_id is the symmetrical opposite of max_id, i.e. it can be used for stepwise pagination from older to newer statuses. The difference to since_id is that since_id will always return the latest statuses, just merely cut off by the provided ID. The new param is supported on all API methods that return statuses.

I'm not sure if this should be a broader issue for new Masto 2.6 API support in general, but this piece seems like it's pretty low-hanging fruit.