Fix readme

Author: cssjoe

readme.txt

@@ -3,7 +3,7 @@ Contributors: boldgrid, fredericktownes, maxicusc, gidomanders, bwmarkle, harryj
 Tags: CDN, pagespeed, caching, performance, optimize
 Requires at least: 5.3
 Tested up to: 6.7
-Stable tag: 2.8.4
+Stable tag: 2.8.5
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html