Merge pull request #60 from dazz/fix-exception-message

bugfix: JsonDecodingException message

Author: justinrainbow

src/JsonSchema/Exception/JsonDecodingException.php

@@ -30,7 +30,7 @@ public function __construct($code = JSON_ERROR_NONE, \Exception $previous = null
                 $message = 'Malformed UTF-8 characters, possibly incorrectly encoded';
                 break;
             case JSON_ERROR_SYNTAX:
-                $message = 'The maximum stack depth has been exceeded';
+                $message = 'JSON syntax is malformed';
                 break;
             default:
                 $message = 'Syntax error';