update to latest version

Author: pfefferle

readme.md

@@ -4,7 +4,7 @@
 - Donate link: https://notiz.blog/donate/
 - Tags: webmention, pingback, trackback, linkback, indieweb
 - Requires at least: 4.9
-- Tested up to: 6.6
+- Tested up to: 6.7
 - Stable tag: 5.3.3
 - Requires PHP: 7.0
 - License: MIT