Bump express from 4.19.2 to 4.20.0 in /example/fallback (#149)

Author: dependabot[bot]

example/fallback/package.json

@@ -7,6 +7,6 @@
     "i18next-resources-to-backend": "1.0.0"
   },
   "devDependencies": {
-    "express": "4.19.2"
+    "express": "4.20.0"
   }
 }