Broken link in README

[anxiousmodernman]

Server returns 403 for me for this link:
https://github.com/RustAudio/rimd/blame/master/README.md#L13

I wish I could suggest some alternative docs, but I'm fairly new to midi programming.

[anxiousmodernman]

Found an alternative page with some fairly detailed MIDI documentation: http://personal.kent.edu/~sbirch/Music_Production/MP-II/MIDI/an_introduction_to_midi_contents.htm

I'm not sure which section applies, but I'll just leave this here.