Update NavigationPlayground dependencies

examples/NavigationPlayground/app.json

@@ -11,7 +11,7 @@
     "splash": {
       "image": "./assets/icons/splash.png"
     },
-    "sdkVersion": "25.0.0",
+    "sdkVersion": "26.0.0",
     "entryPoint": "./node_modules/react-native-scripts/build/bin/crna-entry.js",
     "packagerOpts": {
       "assetExts": [

examples/NavigationPlayground/package.json

@@ -11,9 +11,9 @@
     "test": "flow"
   },
   "dependencies": {
-    "expo": "^25.0.0",
-    "react": "16.2.0",
-    "react-native": "^0.52.0",
+    "expo": "^26.0.0",
+    "react": "16.3.0-alpha.1",
+    "react-native": "^0.54.0",
     "react-native-iphone-x-helper": "^1.0.2",
     "react-navigation": "link:../..",
     "react-navigation-header-buttons": "^0.0.4"
@@ -23,9 +23,9 @@
     "babel-plugin-transform-remove-console": "^6.9.0",
     "flow-bin": "^0.61.0",
     "jest": "^22.1.3",
-    "jest-expo": "^25.1.0",
-    "react-native-scripts": "^1.11.1",
-    "react-test-renderer": "16.0.0"
+    "jest-expo": "^26.0.0",
+    "react-native-scripts": "^1.5.0",
+    "react-test-renderer": "16.3.0-alpha.1"
   },
   "jest": {
     "preset": "jest-expo",