Update Meetup APi

Meetup's REST API will stop working in winter 2021 and be replaced by their GraphQL API which is already active.

README.md

@@ -1258,7 +1258,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Lanyard](https://github.com/Phineas/lanyard) | Retrieve your presence on Discord through an HTTP REST API or WebSocket | No | Yes | Yes |
 | [Line](https://developers.line.biz/) | Line Login, Share on Line, Social Plugins and more | `OAuth` | Yes | Unknown |
 | [LinkedIn](https://docs.microsoft.com/en-us/linkedin/?context=linkedin/context) | The foundation of all digital integrations with LinkedIn | `OAuth` | Yes | Unknown |
-| [Meetup.com](https://www.meetup.com/meetup_api/) | Data about Meetups from Meetup.com | `apiKey` | Yes | Unknown |
+| [Meetup.com](https://www.meetup.com/api/guide) | Data about Meetups from Meetup.com | `apiKey` | Yes | Unknown |
 | [Microsoft Graph](https://docs.microsoft.com/en-us/graph/api/overview) | Access the data and intelligence in Microsoft 365, Windows 10, and Enterprise Mobility | `OAuth` | Yes | Unknown |
 | [MySocialApp](https://mysocialapp.io) | Seamless Social Networking features, API, SDK to any app | `apiKey` | Yes | Unknown |
 | [NAVER](https://developers.naver.com/main/) | NAVER Login, Share on NAVER, Social Plugins and more | `OAuth` | Yes | Unknown |