The README.md needs a slight update, to avoid a runtime issue on modern Debian systems: the package liblua-5.x-0-dbg needs to be installed or vim fails to load the plugin with the error:

gvim: /usr/lib/x86_64-linux-gnu/liblua5.2.so.0: no version information available (required by gvim)
color_coded unavailable: you need to compile it (see README.md)

I have no idea why this is...