Update README.md

Justinas Pošiūnas · web-flow · commit 47c3b448ec6b · 2016-07-04T13:54:01.000+03:00
diff --git a/README.md b/README.md
@@ -6,7 +6,7 @@ You can find more examples and information about MailerLite API v2 here: [http:/
 
 ## Getting started
 
-In order to use this library you need to have at least PHP 5.4 version.
+In order to use this library you need to have at least PHP 5.6 version.
 
 There are two ways to use MailerLite PHP SDK:
 
