Log Message:
py-msgpack: updated to 0.5.0

0.5.0
There are some deprecations. Please read changes carefully.

Changes
* Drop Python 2.6 and ~3.4 support. Python 2.7 and 3.5+ are supported.
* 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. default() is called for tuple too.
* Pure Python implementation supports packing memoryview object.
* Support packing bytearray.
* Add Unpacker.tell(). And write_bytes option is deprecated.

Bugs fixed
* Fixed zero length raw can't be decoded when encoding is specified.