prepare compatibility with WP 6.4

Author: pfefferle

README.md

@@ -2,7 +2,7 @@
 **Contributors:** [automattic](https://profiles.wordpress.org/automattic/), [pfefferle](https://profiles.wordpress.org/pfefferle/), [mediaformat](https://profiles.wordpress.org/mediaformat/), [mattwiebe](https://profiles.wordpress.org/mattwiebe/), [akirk](https://profiles.wordpress.org/akirk/), [jeherve](https://profiles.wordpress.org/jeherve/), [nuriapena](https://profiles.wordpress.org/nuriapena/), [cavalierlife](https://profiles.wordpress.org/cavalierlife/)  
 **Tags:** OStatus, fediverse, activitypub, activitystream  
 **Requires at least:** 4.7  
-**Tested up to:** 6.3  
+**Tested up to:** 6.4  
 **Stable tag:** 1.1.0  
 **Requires PHP:** 5.6  
 **License:** MIT  

readme.txt

@@ -2,7 +2,7 @@
 Contributors: automattic, pfefferle, mediaformat, mattwiebe, akirk, jeherve, nuriapena, cavalierlife
 Tags: OStatus, fediverse, activitypub, activitystream
 Requires at least: 4.7
-Tested up to: 6.3
+Tested up to: 6.4
 Stable tag: 1.1.0
 Requires PHP: 5.6
 License: MIT