Update msgpack-python to 0.5.0

[pyup-bot]

There's a new version of msgpack-python available.
You are currently using 0.4.8. I have updated it to 0.5.0

These links might come in handy: PyPI | Changelog | Homepage

Changelog

0.5.0

======

0.5 is important step toward 1.0. There are some deprecations.
Please read changes carefully.

Changes

• Drop Python 2.6 and 3.2 support

• Deprecate useless custom exceptions. Use ValueError instead of PackValueError,
  Exception instead of PackException and UnpackException, etc...
  See msgpack/exceptions.py

• Add strict_types option to packer. It can be used to serialize subclass of
  builtin types. For example, when packing object which type is subclass of dict,
  default() is called.

• Pure Python implementation supports packing memoryview object.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[vertexmc]

See msgpack/msgpack-python#266

[vEpiphyte]

This will likely be rejected in favor of moving to msgpack==0.5.0 since that is the package name in pypi moving forward

[vertexmc]

Closing in favor of #25