fix getAddressActivity method in blockchain explorer

lib/blockchainexplorer.js

@@ -59,7 +59,7 @@ function getTransactionsInsight(url, addresses, from, to, cb) {
 function getAddressActivityInsight(url, addresses, cb) {
   getTransactionsInsight(url, addresses, 0, 0, function(err, result) {
     if (err) return cb(err);
-    return cb(null, result.items > 0);
+    return cb(null, result.totalItems > 0);
   });
 };