Update GitHub API link (#1389)

README.md

@@ -258,7 +258,7 @@ API | Description | Auth | HTTPS | CORS |
 | [DomainDb Info](https://api.domainsdb.info/) | Domain name search to find all domains containing particular words/phrases/etc | No | Yes | Unknown |
 | [Faceplusplus](https://www.faceplusplus.com/) | A tool to detect face | `OAuth` | Yes | Unknown |
 | [Genderize.io](https://genderize.io) | Estimates a gender from a first name | No | Yes | Yes |
-| [GitHub](https://developer.github.com/v3/) | Make use of GitHub repositories, code and user info programmatically | `OAuth` | Yes | Yes |
+| [GitHub](https://docs.github.com/en/free-pro-team@latest/rest) | Make use of GitHub repositories, code and user info programmatically | `OAuth` | Yes | Yes |
 | [Gitlab](https://docs.gitlab.com/ee/api/) | Automate GitLab interaction programmatically | `OAuth` | Yes | Unknown |
 | [Gitter](https://developer.gitter.im/docs/welcome) | Chat for Developers | `OAuth` | Yes | Unknown |
 | [HTTP2.Pro](https://http2.pro/doc/api) | Test endpoints for client and server HTTP/2 protocol support | No | Yes | Unknown |