Update readme.md

Author: vytisbulkevicius

readme.md

@@ -2,7 +2,7 @@
 **Contributors:** [codeinwp](https://profiles.wordpress.org/codeinwp), [themeisle](https://profiles.wordpress.org/themeisle), [marius2012](https://profiles.wordpress.org/marius2012), [marius_codeinwp](https://profiles.wordpress.org/marius_codeinwp), [hardeepasrani](https://profiles.wordpress.org/hardeepasrani), [rozroz](https://profiles.wordpress.org/rozroz), [Madalin_ThemeIsle](https://profiles.wordpress.org/Madalin_ThemeIsle)  
 **Tags:** tables, charts, pie, visualization, graphs  
 **Requires at least:** 5.2  
-**Tested up to:** 6.5  
+**Tested up to:** 6.6  
 **Requires PHP:** 7.4  
 **Stable tag:** trunk  
 **License:** GPL v2.0 or later