Update readme.txt

Author: selul

readme.txt

@@ -4,7 +4,7 @@ Tags: image optimization, convert webp, image optimizer, lazy load, image, optim
 Requires at least: 5.5
 Tested up to: 6.5
 Requires PHP: 5.4
-Stable tag: 3.12.6
+Stable tag: 3.12.7
 License: GPLv3
 License URI: https://www.gnu.org/licenses/gpl-3.0.en.html