Use latest react-native-navigation

Yarn apparently still has issues with relative paths.

example/package.json

@@ -14,7 +14,7 @@
     "react": "16.0.0-alpha.12",
     "react-native": "0.45.1",
     "react-native-animatable": "^1.1.0",
-    "react-native-navigation": "../"
+    "react-native-navigation": "latest"
   },
   "devDependencies": {
     "detox": "^5.0.0",