Minimal version of PHP is 5.5+

Author: repejota

README.md

@@ -19,7 +19,7 @@ A PHP client for the [NATS messaging system](https://nats.io).
 Requirements
 ------------
 
-* php 5.4+
+* php 5.5+
 * [nats](https://github.com/derekcollison/nats) or [gnatsd](https://github.com/apcera/gnatsd)