Eventlet

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patcher: [py27] recursion error in pytest/python2.7 installing register_at_fork https://github.com/eventlet/eventlet/issues/660
patcher: monkey_patch(builtins=True) failed on py3 because `file` class is gone https://github.com/eventlet/eventlet/issues/541
don't crash on PyPy 7.0.0 https://github.com/eventlet/eventlet/pull/547
Only install monotonic on python2 https://github.com/eventlet/eventlet/pull/583

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* ssl: context wrapped listener fails accept() https://github.com/eventlet/eventlet/issues/651

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* Sorry, Eventlet was broken on Windows for versions 0.27-0.28
patcher: no os.register_at_fork on Windows (654)
* Clean up TypeError in __del__

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* Always remove the right listener from the hub https://github.com/eventlet/eventlet/pull/645

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* patcher: Clean up threading book-keeping at fork when monkey-patched
* backdoor: handle disconnects better

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* pin dnspython <2.0.0 https://github.com/eventlet/eventlet/issues/619