make MultiBuffer public because otherwise gob could not register/encode a client of go-capnproto. i.e. multiBuffer -> MultiBuffer
make MultiBuffer public because otherwise gob could not register/encode a client of go-capnproto. i.e. multiBuffer -> MultiBuffer

zombiezen/go-capnproto,hodduc/go-capnproto2,tpukep/caps,zombiezen/go-capnproto,hodduc/go-capnproto2,zombiezen/go-capnproto2,zombiezen/go-capnproto2