use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/lucas-clemente/quic-go/buffer_pool.go

@@ -0,0 +1,27 @@
+package quic
+
+import (
+	"sync"
+
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+)
+
+var bufferPool sync.Pool
+
+func getPacketBuffer() *[]byte {
+	return bufferPool.Get().(*[]byte)
+}
+
+func putPacketBuffer(buf *[]byte) {
+	if cap(*buf) != int(protocol.MaxReceivePacketSize) {
+		panic("putPacketBuffer called with packet of wrong size!")
+	}
+	bufferPool.Put(buf)
+}
+
+func init() {
+	bufferPool.New = func() interface{} {
+		b := make([]byte, 0, protocol.MaxReceivePacketSize)
+		return &b
+	}
+}