Updated Validator.pizza to MailCheck.ai

Updated Validator.pizza to MailCheck.ai (name, url, and description) to match service's change from December 2nd 2021.

Author: ChaseDurand

README.md

@@ -446,12 +446,12 @@ API | Description | Auth | HTTPS | CORS |
 | [EVA](https://eva.pingutil.com/) | Validate email addresses | No | Yes | Yes |
 | [Kickbox](https://open.kickbox.com/) | Email verification API | No | Yes | Yes |
 | [Lob.com](https://lob.com/) | US Address Verification | `apiKey` | Yes | Unknown |
+| [MailCheck.ai](https://www.mailcheck.ai/#documentation) | Prevent users to sign up with temporary email addresses | No | Yes | Unknown |
 | [Postman Echo](https://www.postman-echo.com) | Test api server to receive and return value from HTTP method | No | Yes | Unknown |
 | [PurgoMalum](http://www.purgomalum.com) | Content validator against profanity & obscenity | No | No | Unknown |
 | [US Autocomplete](https://smartystreets.com/docs/cloud/us-autocomplete-api) | Enter address data quickly with real-time address suggestions | `apiKey` | Yes | Yes |
 | [US Extract](https://smartystreets.com/products/apis/us-extract-api) | Extract postal addresses from any text including emails | `apiKey` | Yes | Yes |
 | [US Street Address](https://smartystreets.com/docs/cloud/us-street-api) | Validate and append data for any US postal address | `apiKey` | Yes | Yes |
-| [Validator.pizza](https://www.validator.pizza/) | Prevent users to register to websites with a disposable email address | No | Yes | Unknown |
 | [vatlayer](https://vatlayer.com/documentation) | VAT number validation | `apiKey` | Yes | Unknown |
 | [Verifier](https://verifier.meetchopra.com/docs#/) | Verifies that a given email is real | `apiKey` | Yes | Yes |
 | [Veriphone](https://veriphone.io) | Phone number validation & carrier lookup | `apiKey` | Yes | Yes |