[ci skip] Officially drop PHP 5.2.x
diff --git a/readme.rst b/readme.rst
index 7a37632..f5d7370 100644
--- a/readme.rst
+++ b/readme.rst
@@ -31,7 +31,7 @@
 
 PHP version 5.6 or newer is recommended.
 
-It should work on 5.2.4 as well, but we strongly advise you NOT to run
+It should work on 5.3.7 as well, but we strongly advise you NOT to run
 such old versions of PHP, because of potential security and performance
 issues, as well as missing features.