v0.22.0

• Changed (API): posts.send, and posts.create with send: true, send to
  the whole audience. They used to stop at 10,000 recipients without saying
  so. One send can reach at most 25,000; a larger audience is refused with a
  422 audience_too_large that carries audience_count and
  max_recipients, and nothing is sent or scheduled. On posts.create the
  error body carries the draft's id. A send also answers 409 post_changed
  when the post was scheduled or edited elsewhere (for example in Mailtea
  Studio) while the request was preparing it, instead of sending it anyway.
  No package change: this is the API's behaviour once it is deployed.

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Released from mailtea-app/mailtea@1d368b5.