Trio-serf

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- Support `RPC
auth <https://serfdom.io/docs/agent/options.htmlrpc_auth>`_ token
when communicating with secure serf members -
`12 <https://github.com/KushalP/serfclient-py/pull/12>`_
- Added `EnvironmentConfig` object that can read Serf environment
variables in an easy way -
`17 <https://github.com/KushalP/serfclient-py/pull/17>`_

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- Fix for spinning forever doing a socket recv after serf
stops/restarts - `7
<https://github.com/KushalP/serfclient-py/pull/7>`_
- Fixing dependency on `serfclient.__version__` in setup.py - `8
<https://github.com/KushalP/serfclient-py/pull/8>`_

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- SerfClient object available as `serfclient.SerfClient` instead of
`serfclient.client.SerfClient` - `4 <https://github.com/KushalP/serfclient-py/pull/4>`_
- No longer using a fixed size to read from the RPC socket - `5 <https://github.com/KushalP/serfclient-py/pull/5>`_
- Add support for filtering the members list - `6 <https://github.com/KushalP/serfclient-py/pull/6>`_

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- Added SerfClient.members() function to provide member information

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- SerfClient returns bounded SerfResult objects to hold the head
and body of the response

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- Fix for issue 1: event payloads can be optional