Bump WP compat

README.md

 # ETH Escape HeadSpace2 #
-**Contributors:** ethitter  
-**Donate link:** https://ethitter.com/donate/  
-**Tags:** seo, meta tags  
-**Requires at least:** 4.4  
-**Tested up to:** 5.7  
-**Stable tag:** 0.2.1  
-**License:** GPLv2 or later  
-**License URI:** http://www.gnu.org/licenses/gpl-2.0.html  
+**Contributors:** ethitter
+**Donate link:** https://ethitter.com/donate/
+**Tags:** seo, meta tags
+**Requires at least:** 4.4
+**Tested up to:** 5.9
+**Stable tag:** 0.2.1
+**License:** GPLv2 or later
+**License URI:** http://www.gnu.org/licenses/gpl-2.0.html
 
 Output existing HeadSpace2 data without the original plugin. Deactivate HeadSpace2 (no longer maintained) without impactacting legacy content.