Add mailsac (#1905)

README.md

@@ -1007,6 +1007,7 @@ API | Description | Auth | HTTPS | CORS |
 | [FakerAPI](https://fakerapi.it/en) | APIs collection to get fake data | No | Yes | Yes |
 | [JSONPlaceholder](http://jsonplaceholder.typicode.com/) | Fake data for testing and prototyping | No | No | Unknown |
 | [Loripsum](http://loripsum.net/) | The "lorem ipsum" generator that doesn't suck | No | No | Unknown |
+| [Mailsac](https://mailsac.com/docs/api) | Disposable Email | `apiKey` | Yes | Unknown |
 | [PIPL](https://pipl.ir/) | Free and public API that generates random and fake people's data in JSON | No | Yes | No |
 | [QuickMocker](https://quickmocker.com) | API mocking tool to generate contextual, fake or random data | No | Yes | Yes |
 | [Randommer](https://randommer.io/randommer-api) | Random data generator | `apiKey` | Yes | Yes |