Fix for PHP8.2 deprecation - property must be defined in class, not dynamically (#36)

Author: chrisputnam9

src/HJSON/HJSONStringifier.php

@@ -24,6 +24,7 @@ class HJSONStringifier
     private $needsEscapeName = '/[,\{\[\}\]\s:#"\']|\/\/|\/\*|\'\'\'/';
     private $gap = '';
     private $indent = '  ';
+    private $meta = null;
 
     // options
     private $eol;