Bump ROI_VERSION to 1.0.20 for cache invalidation

Forces browsers to fetch updated adsense-loader.js with the
typo fix (roidsenseDelayed → roiAdsenseDelayed).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

functions.php

@@ -18,7 +18,7 @@ if (!defined('ABSPATH')) {
 }
 
 // Definir constante de versión del tema
-define('ROI_VERSION', '1.0.19');
+define('ROI_VERSION', '1.0.20');
 
 // =============================================================================
 // 1. CARGAR AUTOLOADER MANUAL