`leavelog`: Log whenever someone leaves the server.

    The log contains the former member's DiscordTag, username they had been
    using in the server, and how long they had been in the server.

    You must have the Manage Server permission in order to enable or disable
    the leave log.

    **Usage:**
        `leavelog enable`: Start logging in this channel.
        `leavelog disable`: Stop logging.