49f5eb0 Use msgpack from PyPI, not msgpack-python (deprecated)

Authored and Committed by churchyard 5 years ago
    Use msgpack from PyPI, not msgpack-python (deprecated)
    
    msgpack-python was renamed to msgpack at 0.5.
    msgpack-python still works but is deprecated. See:
    
     * https://pypi.org/project/msgpack-python/
     * https://pypi.org/project/msgpack/
    
    Added backwards compatibility provides.
    
        
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