fix(package): update react-navigation to version 4.3.5

Closes #11

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "jest": "^23.6.0",
     "react": "16.5.0",
     "react-native": "https://github.com/expo/react-native/archive/sdk-31.0.0.tar.gz",
-    "react-navigation": "^3.0.4",
+    "react-navigation": "^4.3.5",
     "react-redux": "^5.1.1",
     "react-test-renderer": "^16.6.3",
     "redux": "^4.0.1"