Pass `use_bin_type` as argument to `packb`
Pass `use_bin_type` as argument to `packb`

This is necessary for supporting msgpack 2.0 in Neovim, which treats all strings
as `BIN`.

Shougo/python-client,Shougo/python-client,brcolow/python-client,bfredl/python-client,neovim/python-client,zchee/python-client,0x90sled/python-client,fwalch/python-client,timeyyy/python-client,0x90sled/python-client,zchee/python-client,meitham/python-client,brcolow/python-client,starcraftman/python-client,neovim/python-client,meitham/python-client,traverseda/python-client,fwalch/python-client,bfredl/python-client,starcraftman/python-client,traverseda/python-client,timeyyy/python-client