Add brew & opam update to installation instruction
Add brew & opam update to installation instruction
cristianoc/reason,cristianoc/reason,facebook/reason,let-def/reason,ak3n/reason,yunxing/reason,chenglou/reason,ak3n/reason,yunxing/reason,facebook/reason,ak3n/reason,yunxing/reason,ak3n/reason,let-def/reason,let-def/reason,yunxing/reason,chenglou/reason,chenglou/reason,facebook/reason,cristianoc/reason