v0.19.0

• Changed: template history records the sender. Each entry from
  templates.versions() carries from (read it as entry["from"]),
  reply_to and sender_recorded, an update that changes only the From or
  Reply-To records a version (or folds into the open one, like any edit), and
  templates.restore_version() brings the version's From and Reply-To back
  with the design. A version with sender_recorded False was recorded
  before this change and leaves the current From and Reply-To alone when
  restored. The behaviour comes from the API and reaches every package version
  on deploy; this release updates the docstrings.

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Released from mailtea-app/mailtea@ff8e7ef.