Add Httpbin API to Development

README.md

@@ -311,6 +311,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Hexabin](https://hexabin.herokuapp.com/) | Convert and retrieve hexadecimal, binary, decimal, and octal values with ease | No | No | Unknown |
 | [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 |
+| [Httpbin](https://httpbin.org/) | A Simple HTTP Request & Response Service | No | Yes | Yes |
 | [IBM Text to Speech](https://cloud.ibm.com/docs/text-to-speech/getting-started.html) | Convert text to speech | `apiKey` | Yes | Yes |
 | [Icanhazip](https://major.io/icanhazip-com-faq/) | IP Address API | No | Yes | Yes |
 | [IFTTT](https://platform.ifttt.com/docs/connect_api) | IFTTT Connect API | No | Yes | Unknown |