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Generates a Presence tracker for your application.

    mix phx.gen.presence

    mix phx.gen.presence MyPresence

The only argument is the module name of the Presence tracker,
which defaults to Presence.

A new file will be generated in `lib/my_app_web/channels/presence.ex`,
where `my_app_web` is the snake cased version of the module name provided.
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