make example use latest version of RNIW

Author: sw-yx

example/package.json

@@ -12,7 +12,7 @@
     "@types/react-dom": "16.8.4",
     "react": "^16.8.6",
     "react-dom": "^16.8.6",
-    "react-netlify-identity-widget": "^0.1.0",
+    "react-netlify-identity-widget": "latest",
     "react-scripts": "^3.0.0",
     "typescript": "3.4.5"
   },