fix buffer deprecation

lib/scrypt-for-humans.coffee

@@ -68,7 +68,7 @@ module.exports =
 
 	verifyHash: (password, hash, callback) ->
 		(new Promise (resolve, reject) ->
-			hashBuffer = new Buffer(hash, "base64")
+			hashBuffer = Buffer.from(hash, "base64")
 			scrypt.verifyKdf hashBuffer, normalizePassword(password), scryptHandler(resolve, reject)
 		).nodeify(callback)
 

lib/scrypt-for-humans.js

@@ -56,7 +56,7 @@ normalizePassword = function(password) {
   if (Buffer.isBuffer(password)) {
     return password;
   } else {
-    return new Buffer(password);
+    return Buffer.from(password);
   }
 };
 
@@ -113,7 +113,7 @@ module.exports = {
   verifyHash: function(password, hash, callback) {
     return (new Promise(function(resolve, reject) {
       var hashBuffer;
-      hashBuffer = new Buffer(hash, "base64");
+      hashBuffer = Buffer.from(hash, "base64");
       return scrypt.verifyKdf(hashBuffer, normalizePassword(password), scryptHandler(resolve, reject));
     })).nodeify(callback);
   },