Require v3 releases

Require v3 releases of core functionality:

- zend-eventmanager
- zend-servicemanager
- zend-stdlib

Author: weierophinney

composer.json

@@ -14,12 +14,12 @@
     },
     "require": {
         "php": "^5.5 || ^7.0",
-        "zendframework/zend-eventmanager": "^2.6.2 || ^3.0",
+        "zendframework/zend-eventmanager": "^3.0",
         "zendframework/zend-http": "^2.5.4",
         "zendframework/zend-modulemanager": "^2.7.1",
         "zendframework/zend-router": "^3.0",
         "zendframework/zend-servicemanager": "^3.0.3",
-        "zendframework/zend-stdlib": "^2.7.5 || ^3.0",
+        "zendframework/zend-stdlib": "^3.0",
         "zendframework/zend-view": "^2.6.3",
         "container-interop/container-interop": "^1.1"
     },