v0.11.0

• Changed: automations.activate() documents the no_verified_sender refusal.
  A 422 with that code means a send_email step has no sender it can send
  from; reason (NO_SENDER, DOMAIN_NOT_VERIFIED, WRONG_PURPOSE,
  DKIM_NOT_VERIFIED or INVALID_FROM) says which, and steps[] names every
  blocking step. Previously only automation_invalid was documented.
• Added: domains.update(id, tracking_subdomain=None) removes a tracking
  subdomain. The domain's links go back to being served from the Mailtea host.
  Links in mail you have already sent point at the old hostname and stop
  resolving — there is no way to reinstate them. The None reaches the wire as
  an explicit null, so omitting the key and passing None are different
  requests. An empty string is neither: it is refused with
  tracking_subdomain_invalid.
• Changed: the MX row in records now reports what the last verify found,
  instead of reading pending on every request but the verify itself. A domain
  nobody has verified reads not_started.

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Released from mailtea-app/mailtea@fed0718.