added cutt.ly as link shortener service

README.md

@@ -1446,6 +1446,7 @@ API | Description | Auth | HTTPS | CORS |
 | [CleanURI](https://cleanuri.com/docs) | URL shortener service | No | Yes | Yes |
 | [ClickMeter](https://support.clickmeter.com/hc/en-us/categories/201474986) | Monitor, compare and optimize your marketing links | `apiKey` | Yes | Unknown |
 | [Clico](https://cli.com/swagger-ui/index.html?configUrl=/v3/api-docs/swagger-config) | URL shortener service | `apiKey` | Yes | Unknown |
+| [Cutt.ly](https://cutt.ly/api-documentation/cuttly-links-api) | URL shortener service | `apiKey` | Yes | Unknown |
 | [Git.io](https://github.blog/2011-11-10-git-io-github-url-shortener/) | Git.io URL shortener | No | Yes | Unknown |
 | [GoTiny](https://github.com/robvanbakel/gotiny-api) | A lightweight URL shortener, focused on ease-of-use for the developer and end-user | No | Yes | Yes |
 | [Kutt](https://docs.kutt.it/) | Free Modern URL Shortener | `apiKey` | Yes | Yes |