Support for treating strings as binary

[thedrow]

msgpack 2.0 has the ability to treat strings as binary.
http://fperrad.github.io/lua-MessagePack/msgpack.html (see the set_string method)
Unfortunately this is not supported with this library.
When serializing strings as binary I get the following error from redis: Bad data format in input
What can I do to help resolve this issue?

[muzuiget]

It look like author drop support this project, I fork it to fix myself. Here is my path muzuiget@f45b9e6

I lazy to read the msgpack spec, but read the another lua msgpack library https://github.com/fperrad/lua-MessagePack source code, which I use before in my project. It has option let you to choose treat Lua string as what msgpack type is.

The key code is here https://github.com/fperrad/lua-MessagePack/blob/master/src5.3/MessagePack.lua#L76,L116 It look like just need to change the flag bytes. I test on my project it work fine.