v16.0.0

• Add new property MegolmDecryptionError.withheldCode, which returns a withheld
  code such as m.unverified if we received a withheld notification for the
  session associated with the UTD event.
  (#269)

• Update matrix-rust-sdk to 0.16.0, which includes:

  Features:

  • When we receive an inbound Megolm session from two different sources, merge the two copies together to get the best of both.
    (#5865
  • When constructing a key bundle for history sharing, if we had received a key bundle ourselves, in which one or more sessions was marked as "history not shared", pass that on to the new user.
    (#5820
  • Use new withheld code in key bundles for sessions not marked as
    shared_history.
    (#5807
  • Improve feedback support for shared history when downloading room key
    bundles.
    (#5737)

  Bugfixes:

  • Fix a bug which caused encrypted to-device messages from unknown devices to be ignored.
    (#5763)
  • Fix a bug which caused history shared on invite to be ignored when "exclude insecure devices" was enabled.
    (#5763)
  • Fix a bug introduced in 0.14.0 which meant that the serialization of the value returned by OtherUserIdentity::verification_request_content did not include a msgtype field.
    (#5642)