update redirect info

Author: diwash007

docs/README.md

@@ -40,7 +40,7 @@ Pull requests are welcome. For major changes, please open an issue first to disc
 - Go to https://console.cloud.google.com/ and create a new project
 - Enable Google Calendar API and create an OAuth 2.0 client ID
 - add following on the Authorised redirect URIs of OAuth client ID
-```python
+```bash
 http://localhost/
 ```
 - Download the JSON file and rename it to `credentials.json`