Update playground to expo sdk 30 and add commented out screens option in App.js

examples/NavigationPlayground/App.js

@@ -1,2 +1,7 @@
+import { useScreens } from 'react-native-screens';
+
+// Uncomment this to use react-native-screens
+// useScreens();
+
 import App from './js/App';
 export default App;

examples/NavigationPlayground/app.json

@@ -11,7 +11,7 @@
     "splash": {
       "image": "./assets/icons/splash.png"
     },
-    "sdkVersion": "28.0.0",
+    "sdkVersion": "30.0.0",
     "assetBundlePatterns": [
       "**/*"
     ],

examples/NavigationPlayground/package.json

@@ -7,10 +7,11 @@
     "start": "expo start",
     "android": "expo start --android",
     "ios": "expo start --ios",
-    "test": "flow"
+    "test": "flow",
+    "postinstall": "rm -rf node_modules/react-native-screens"
   },
   "dependencies": {
-    "expo": "^28.0.0",
+    "expo": "^30.0.0",
     "invariant": "^2.2.4",
     "react": "16.3.1",
     "react-native": "^0.55.0",