update quic-go to v0.9.0, use the quic-go milestone version

p2p/transport/quic/conn.go

@@ -25,7 +25,7 @@ type conn struct {
 var _ tpt.Conn = &conn{}
 
 func (c *conn) Close() error {
-	return c.sess.Close(nil)
+	return c.sess.Close()
 }
 
 // IsClosed returns whether a connection is fully closed.

p2p/transport/quic/listener.go

@@ -65,7 +65,7 @@ func (l *listener) Accept() (tpt.Conn, error) {
 		}
 		conn, err := l.setupConn(sess)
 		if err != nil {
-			sess.Close(err)
+			sess.CloseWithError(0, err)
 			continue
 		}
 		return conn, nil

p2p/transport/quic/transport.go

@@ -19,11 +19,11 @@ import (
 )
 
 var quicConfig = &quic.Config{
+	Versions:                              []quic.VersionNumber{quic.VersionMilestone0_9_0},
 	MaxIncomingStreams:                    1000,
 	MaxIncomingUniStreams:                 -1,              // disable unidirectional streams
 	MaxReceiveStreamFlowControlWindow:     3 * (1 << 20),   // 3 MB
 	MaxReceiveConnectionFlowControlWindow: 4.5 * (1 << 20), // 4.5 MB
-	Versions: []quic.VersionNumber{101},
 	AcceptCookie: func(clientAddr net.Addr, cookie *quic.Cookie) bool {
 		// TODO(#6): require source address validation when under load
 		return true