- update to 2.0.15:
  * Deleting the group configured as the anonymous group in the Dynamic Security
    plugin, would leave a dangling pointer that could lead to a single crash.
    This is considered a minor issue - only administrative users should have
    access to dynsec, the impact on availability is one-off, and there is no
    associated loss of data. It is now forbidden to delete the group configured
    as the anonymous group.
  * Fix memory leak when a plugin modifies the topic of a message in
    MOSQ_EVT_MESSAGE.
  * Fix bridge `restart_timeout` not being honoured.
  * Fix potential memory leaks if a plugin modifies the message in the
    MOSQ_EVT_MESSAGE event.
  * Fix unused flags in CONNECT command being forced to be 0, which is not
    required for MQTT v3.1. Closes #2522.
  * Improve documentation of `persistent_client_expiration` option.
    Closes #2404.
  * Add clients to session expiry check list when restarting and reloading from
   persistence. Closes #2546.
  * Fix bridges not sending failure notification messages to the local broker if
    the remote bridge connection fails. Closes #2467. Closes #1488.
  * Fix some PUBLISH messages not being counted in $SYS stats. Closes #2448.
  * Fix incorrect return code being sent in DISCONNECT when a client session is
    taken over. Closes #2607.
  * Fix confusing "out of memory" error when a client is kicked in the dynamic
    security plugin. Closes #2525.
  * Fix confusing error message when dynamic security config file was a
    directory. Closes #2520.
  * Fix bridge queued messages not being persisted when local_cleansession is
    set to false and cleansession is set to true. Closes #2604.
  * Dynamic security: Fix modifyClient and modifyGroup commands to not modify

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