update README, syntax-rules is now provided
update README, syntax-rules is now provided

picrin-scheme/picrin,ktakashi/picrin,leavesbnw/picrin,omasanori/picrin,dcurrie/picrin,dcurrie/picrin,koba-e964/picrin,koba-e964/picrin,picrin-scheme/picrin,omasanori/picrin,leavesbnw/picrin,koba-e964/picrin,ktakashi/picrin,ktakashi/picrin,leavesbnw/picrin