Added 4chan to social category

This read-only api is easy to use and is generous with all the latest community discussions.

README.md

@@ -731,6 +731,7 @@ API | Description | Auth | HTTPS | CORS |
 ### Social
 API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
+| [4chan](https://github.com/4chan/4chan-API) | Simple image-based bulletin board dedicated to a variety of topics | No | Yes | Yes |
 | [Buffer](https://buffer.com/developers/api) | Access to pending and sent updates in Buffer | `OAuth` | Yes | Unknown |
 | [Carro Score](https://docs.score.getcarro.com/) | Social Media Influence Rating | `apiKey` | Yes | Yes |
 | [Cisco Spark](https://developer.ciscospark.com) | Team Collaboration Software | `OAuth` | Yes | Unknown |