add submit check

.travis.gofmt.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-if [ -n "$(gofmt -l .)" ]; then
+if [ -n "$(gofmt -l .)" -o $(golint ./... | wc | awk '{print $1}') -gt "2" ]; then
     echo "Go code is not formatted:"
     gofmt -d .
     exit 1

syncing/syncing.go

@@ -265,6 +265,7 @@ func (ss *StateSync) generateStateSyncTaskQueue(bc *blockchain.Blockchain) {
 			for id, blockHash := range configPeer.blockHashes {
 				if bc.Blocks[id] == nil || !reflect.DeepEqual(bc.Blocks[id].Hash[:], blockHash) {
 					ss.stateSyncTaskQueue.Put(SyncBlockTask{index: id, blockHash: blockHash})
+					// TODO(minhdoan): Check error
 				}
 			}
 			break