Add Heroku Platform (#2788)

README.md

@@ -484,6 +484,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Google Slides](https://developers.google.com/slides/api/reference/rest) | API to read, write, and format Google Slides presentations | `OAuth` | Yes | Unknown |
 | [Gorest](https://gorest.co.in/) | Online REST API for Testing and Prototyping | `OAuth` | Yes | Unknown |
 | [Hasura](https://hasura.io/opensource/) | GraphQL and REST API Engine with built in Authorization | `apiKey` | Yes | Yes |
+| [Heroku](https://devcenter.heroku.com/articles/platform-api-reference/) | REST API to programmatically create apps, provision add-ons and perform other task on Heroku | `OAuth` | Yes | Yes |
 | [host-t.com](https://host-t.com) | Basic DNS query via HTTP GET request | No | Yes | No |
 | [Host.io](https://host.io) | Domains Data API for Developers | `apiKey` | Yes | Yes |
 | [HTTP2.Pro](https://http2.pro/doc/api) | Test endpoints for client and server HTTP/2 protocol support | No | Yes | Unknown |