chore(docs): Mention BgUtils for generating PoTokens

https://github.com/LuanRT/BgUtils

README.md

@@ -97,7 +97,7 @@ const youtube = await Innertube.create(/* options */);
 | `location` | `string` | Geolocation. | `US` |
 | `account_index` | `number` | The account index to use. This is useful if you have multiple accounts logged in. **NOTE:** Only works if you are signed in with cookies. | `0` |
 | `visitor_data` | `string` | Setting this to a valid and persistent visitor data string will allow YouTube to give this session tailored content even when not logged in. A good way to get a valid one is by either grabbing it from a browser or calling InnerTube's `/visitor_id` endpoint. | `undefined` |
-| `po_token` | `string` | Proof of Origin Token. This is an attestation token generated by BotGuard/DroidGuard. It is used to confirm that the request is coming from a genuine device. To obtain a valid token, please refer to [Invidious' Trusted Session Generator](https://github.com/iv-org/youtube-trusted-session-generator). | `undefined` |
+| `po_token` | `string` | Proof of Origin Token. This is an attestation token generated by BotGuard/DroidGuard. It is used to confirm that the request is coming from a genuine client. Valid tokens can be generated using [BgUtils](https://github.com/LuanRT/BgUtils) or  [Invidious' tool](https://github.com/iv-org/youtube-trusted-session-generator). | `undefined` |
 | `retrieve_player` | `boolean` | Specifies whether to retrieve the JS player. Disabling this will make session creation faster. **NOTE:** Deciphering formats is not possible without the JS player. | `true` |
 | `enable_safety_mode` | `boolean` | Specifies whether to enable safety mode. This will prevent the session from loading any potentially unsafe content. | `false` |
 | `generate_session_locally` | `boolean` | Specifies whether to generate the session data locally or retrieve it from YouTube. This can be useful if you need more performance. **NOTE:** If you are using the cache option and a session has already been generated, this will be ignored. If you want to force a new session to be generated, you must clear the cache or disable session caching. | `false` |
@@ -783,4 +783,4 @@ Distributed under the [MIT](https://choosealicense.com/licenses/mit/) License.
 
 <p align="right">
 (<a href="#top">back to top</a>)
-</p>
+</p>