update readme

Author: miladrahimi

README.md

@@ -20,7 +20,7 @@ Supported features:
 * PSR-7 requests and responses
 * Request, response and router instance injection
 
-It supports PHP `v7.1`, `v7.2`, `v7.3` and `v7.4`.
+It supports PHP `v7.1` and newer versions.
 
 ## Versions