Added holiday API and Abstract API

README.md

@@ -139,6 +139,7 @@ API | Description | Auth | HTTPS | CORS |
 ### Calendar
 API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
+| [Abstract Public Holiday API](https://www.abstractapi.com/holidays-api) | Data on national, regional, and religious holidays via API | `apiKey` | Yes | Yes |
 | [Calendar Index](https://www.calendarindex.com/) | Worldwide Holidays and Working Days | `apiKey` | Yes | Yes |
 | [Church Calendar](http://calapi.inadiutorium.cz/) | Catholic liturgical calendar | No | No | Unknown |
 | [Czech Namedays Calendar](http://svatky.adresa.info/) | Lookup for a name and returns nameday date | No | No | Unknown |
@@ -222,6 +223,7 @@ API | Description | Auth | HTTPS | CORS |
 ### Data Validation
 API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
+| [Abstract API](https://www.abstractapi.com) | Validate emails, phone numbers, VAT numbers, and more | `apiKey` | Yes | Yes |
 | [Cloudmersive Validate](https://cloudmersive.com/validate-api) | Validate email addresses, phone numbers, VAT numbers and domain names | `apiKey` | Yes | Yes |
 | [languagelayer](https://languagelayer.com) | Language detection | No | Yes | Unknown |
 | [Lob.com](https://lob.com/) | US Address Verification | `apiKey` | Yes | Unknown |