Allow use of stdlib 3.x

Author: troosan

composer.json

@@ -38,7 +38,7 @@
         "php": ">=5.3.3",
         "ext-xml": "*",
         "zendframework/zend-escaper": "^2.2",
-        "zendframework/zend-stdlib": "^2.2",
+        "zendframework/zend-stdlib": "^2.2 || ^3.0",
         "phpoffice/common": "^0.2"
     },
     "require-dev": {