Updates Readme to Reflect Changes to CakePHP Versions

Signed-off-by: Justin Yost <justin@loadsys.com>

Author: justinyost

README.md

@@ -15,7 +15,7 @@ A CakePHP plugin that provides a Shell to read an app's Configure vars from the
 
 ## Requirements
 
-* CakePHP 3.0.0+
+* CakePHP 3.1.0+
 * PHP 5.6+