updating listeners should be thread safe #174
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This allows clients to stop listening before shutdown without hitting things like:
Exception in thread StompReceiverThread-3:
Traceback (most recent call last):
File "/projects/lib/python3.6/threading.py", line 916, in _bootstrap_inner
self.run()
File "/projects/lib/python3.6/threading.py", line 864, in run
self._target(*self._args, **self._kwargs)
File "/projects/lib/python3.6/site-packages/stomp/transport.py", line 335, in __receiver_loop
self.process_frame(f, frame)
File "/projects/lib/python3.6/site-packages/stomp/transport.py", line 188, in process_frame
self.notify(frame_type, f.headers, f.body)
File "/projects/lib/python3.6/site-packages/stomp/transport.py", line 221, in notify
for listener in self.listeners.values():
RuntimeError: dictionary changed size during iteration