Update example to use 2.3.0

Author: e-schultz

examples/counter/package.json

@@ -30,7 +30,7 @@
     "@angular/platform-browser": "^2.0.0-rc.1",
     "@angular/platform-browser-dynamic": "^2.0.0-rc.1",
     "core-js": "^2.3.0",
-    "ng2-redux": "^2.2.3",
+    "ng2-redux": "^2.3.0-beta.0",
     "react": "^0.14.8",
     "redux": "^3.4.0",
     "redux-logger": "^2.6.1",