shorten closure

Author: dynst

packages/bitcore-lib/lib/transaction/input/multisig.js

@@ -121,7 +121,7 @@ MultiSigInput.prototype._updateScript = function() {
 
 MultiSigInput.prototype._createSignatures = function() {
   return _.map(
-    this.signatures.filter(signature => { return !_.isUndefined(signature); }),
+    this.signatures.filter(signature => !_.isUndefined(signature)),
     // Future signature types may need refactor of toDER
     function(signature) {
       return BufferUtil.concat([