Bump react-navigation[-redux-helpers].

package.json

@@ -18,8 +18,8 @@
   "author": "Herby Vojčík <herby@mailbox.sk>",
   "license": "MIT",
   "dependencies": {
-    "react-navigation": "^1.2.1",
-    "react-navigation-redux-helpers": "^1.0.1",
+    "react-navigation": "^2.0.1",
+    "react-navigation-redux-helpers": "^1.0.6",
     "react-redux": "^5.0.7"
   }
 }