switch to go vendoring

vendor/github.com/go-micro/plugins/v4/server/http/buffer.go

@@ -0,0 +1,14 @@
+package http
+
+import (
+	"bytes"
+)
+
+type buffer struct {
+	*bytes.Buffer
+}
+
+func (b *buffer) Close() error {
+	b.Buffer.Reset()
+	return nil
+}