Switching deprecated buffer constructor to use Buffer.from

lib/address.js

@@ -463,9 +463,8 @@ Address.prototype.isPayToScriptHash = function() {
  * @returns {Buffer} Bitcoin address buffer
  */
 Address.prototype.toBuffer = function() {
-  var version = new Buffer([this.network[this.type]]);
-  var buf = Buffer.concat([version, this.hashBuffer]);
-  return buf;
+  var version = Buffer.from([this.network[this.type]]);
+  return Buffer.concat([version, this.hashBuffer]);
 };
 
 /**

lib/transaction/transaction.js

@@ -474,7 +474,7 @@ Transaction.prototype.getLockTime = function() {
 };
 
 Transaction.prototype.fromString = function(string) {
-  this.fromBuffer(new buffer.Buffer(string, 'hex'));
+  this.fromBuffer(buffer.Buffer.from(string, 'hex'));
 };
 
 Transaction.prototype._newTransaction = function() {