readme: update

dg · dg · commit 127240a14b05 · 2019-03-22T01:57:48.000+01:00
diff --git a/readme.md b/readme.md
@@ -26,7 +26,7 @@ The recommended way to install Nette Caching is via Composer:
 composer require nette/caching
 ```
 
-It requires PHP version 5.6 and supports PHP up to 7.3. The dev-master version requires PHP 7.1.
+It requires PHP version 7.1 and supports PHP up to 7.3.
 
 
 Usage
