Pmxbot

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* 72: Fixed Karma operations on MongoDB 3.6.

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* 66: It's not simply "quit" either. It's either part (left channel)
or quit (disconnecting). Restored ``on_leave`` as the decorator
handling either event.

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* A new configuration setting ``database params`` is
now honored for the MongoDB storage and any parameters
specified for that key will be passed directly to the
`MongoClient
<http://api.mongodb.com/python/current/api/pymongo/mongo_client.html>`_
constructor.

* 66: [IRC] Renamed ``on_leave`` decorator and other references to
a "leave" event to instead honor ``on_quit``, the event
that an IRC server will actually transmit when a user leaves...
erm, quits a channel.

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* 64: Restore support for TCP keepalives, broken in 1117.

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* 62: Fixed error in regexp docs.
* 50: [Slack] Added support for replying in a thread.

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* 61: Thanks command now parses a reason and assigns
karma to the subject without the reason.