Diactoros upgraded

Author: mkorkmaz

composer.json

@@ -21,7 +21,7 @@
     "selami/views": "^0.9",
     "zendframework/zend-config": "^3.2",
     "zendframework/zend-servicemanager": "^3.3",
-    "zendframework/zend-diactoros": "^1.8",
+    "zendframework/zend-diactoros": "^2.0",
     "zendframework/zend-httphandlerrunner": "^1.0"
   },
   "require-dev": {