Update app.py

app.py

@@ -527,7 +527,7 @@ def main():
         })
 
   # Write JSON to file
-  with open(DATA_FILE, 'a') as f: #w+
+  with open(DATA_FILE, 'w') as f: #w+
     json.dump(json_data, f)
     repo.push_to_hub()