Enabled zend-code ^3.0

Author: thomasvargiu

composer.json

@@ -25,7 +25,7 @@
         "doctrine/annotations": "~1.0",
         "zendframework/zend-cache": "^2.6.1",
         "zendframework/zend-captcha": "^2.5.4",
-        "zendframework/zend-code": "^2.6",
+        "zendframework/zend-code": "^2.6 || ^3.0",
         "zendframework/zend-escaper": "^2.5",
         "zendframework/zend-eventmanager": "^2.6.2 || ^3.0",
         "zendframework/zend-filter": "^2.6",