Add instructions on using libyaml
Add instructions on using libyaml

For a 10x speed increase!
poussik/vcrpy,graingert/vcrpy,kevin1024/vcrpy,ByteInternet/vcrpy,mgeisler/vcrpy,ByteInternet/vcrpy,yarikoptic/vcrpy,agriffis/vcrpy,poussik/vcrpy,graingert/vcrpy,kevin1024/vcrpy,bcen/vcrpy