- Update to 1.6:
  * Modes allow to conditonally change options at runtime, and allow to
    setup things like a "do not disturb" mode.
  * Add support for synchronous hints, to easily replace an existing
    notification from a script.
  * Add an "exec" binding to execute a command
  * Add "on-notify" bindings to trigger an action when a notification
    is opened.
  * Several small improvments and bugfixes:

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