_pkg.dev: drop mblock wrapper

No use for us.

_pkg.dev/wire/payload/mblock.go

@@ -1,38 +0,0 @@
-package payload
-
-import (
-	"io"
-
-	"github.com/CityOfZion/neo-go/pkg/wire/util"
-
-	"github.com/CityOfZion/neo-go/pkg/wire/command"
-)
-
-// BlockMessage represents a block message on the neo-network
-type BlockMessage struct {
-	Block
-}
-
-// NewBlockMessage will return a block message object
-func NewBlockMessage() (*BlockMessage, error) {
-	return &BlockMessage{}, nil
-}
-
-// DecodePayload Implements Messager interface
-func (b *BlockMessage) DecodePayload(r io.Reader) error {
-	br := &util.BinReader{R: r}
-	b.Block.DecodePayload(br)
-	return br.Err
-}
-
-// EncodePayload Implements messager interface
-func (b *BlockMessage) EncodePayload(w io.Writer) error {
-	bw := &util.BinWriter{W: w}
-	b.Block.EncodePayload(bw)
-	return bw.Err
-}
-
-// Command Implements messager interface
-func (b *BlockMessage) Command() command.Type {
-	return command.Block
-}