Add Instatus (#2463)

README.md

@@ -243,6 +243,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Gmail](https://developers.google.com/gmail/api/) | Flexible, RESTful access to the user's inbox | `OAuth` | Yes | Unknown |
 | [Google Analytics](https://developers.google.com/analytics/) | Collect, configure and analyze your data to reach the right audience | `OAuth` | Yes | Unknown |
 | [ImprovMX](https://improvmx.com/api) | API for free email forwarding service | `apiKey` | Yes | Unknown |
+| [Instatus](https://instatus.com/help/api) | Post to and update maintenance and incidents on your status page through an HTTP REST API | `apiKey` | Yes | Unknown |
 | [mail.tm](https://docs.mail.tm) | Temporary Email Service | No | Yes | Yes |
 | [MailboxValidator](https://www.mailboxvalidator.com/api-email-free) | Validate email address to improve deliverability | `apiKey` | Yes | Unknown |
 | [Mailchimp](https://mailchimp.com/developer/) | Send marketing campaigns and transactional mails | `apiKey` | Yes | Unknown |