Compatibility table updated

Author: Webklex

README.md

@@ -46,6 +46,7 @@ Discord: [discord.gg/rd4cN9h6][link-discord]
 ## Compatibility
 | Version | PHP 5.6 | PHP 7 | PHP 8 |
 |:--------|:-------:|:-----:|:-----:|
+| v6.x    |    /    |   /   |   X   |
 | v5.x    |    /    |   /   |   X   |
 | v4.x    |    /    |   X   |   X   |
 | v3.x    |    /    |   X   |   /   |