Update README.md

added note that using Lua > 5.1 will not work

Author: frwiqueueit

README.md

@@ -1,5 +1,5 @@
 # KnownUser.V3.Lua
-The Queue-it Security Framework is used to ensure that end users cannot bypass the queue by adding a server-side integration to your server. It was developed and verified with Lua v.5.1.
+The Queue-it Security Framework is used to ensure that end users cannot bypass the queue by adding a server-side integration to your server. It was developed and verified with Lua v.5.1. **Running this SDK on Lua versions higher than this (ex. v.5.3) will not work**.   
 
 ## Introduction
 When a user is redirected back from the queue to your website, the queue engine can attach a query string parameter (`queueittoken`) containing some information about the user. 
@@ -75,4 +75,4 @@ If you need to protect AJAX calls beside page loads you need to add the below Ja
   type="text/javascript"
   src="//static.queue-it.net/script/queueconfigloader.min.js">
 </script>
-```
+```