fix import

Author: nicholasguo

ledger/blockqueue_test.go

@@ -18,7 +18,6 @@ package ledger
 
 import (
 	"fmt"
-	"github.com/algorand/go-algorand/protocol"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -28,6 +27,7 @@ import (
 	"github.com/algorand/go-algorand/crypto"
 	"github.com/algorand/go-algorand/data/bookkeeping"
 	"github.com/algorand/go-algorand/logging"
+	"github.com/algorand/go-algorand/protocol"
 )
 
 func TestPutOldBlock(t *testing.T) {