Remove passwords from default parameters

Author: emr

src/Gateway.php

@@ -23,9 +23,9 @@ public function getDefaultParameters()
             'terminalId' => '',
             'merchantId' => '',
             'username' => 'PROVAUT',
-            'password' => '123qweASD',
+            'password' => '',
             'refundusername' => 'PROVRFN',
-            'refundpassword' => '123qweASD',
+            'refundpassword' => '',
             'installment' => '',
             'type' => 'preauth',
             'testMode' => false,