Add nykula to CREDITS.md (#7964)

Follow-up to FreshRSS#7961.

Co-authored-by: Alexis Degrugillier <aledeg@users.noreply.github.com>

CREDITS.md

@@ -66,6 +66,7 @@ People are sorted by name so please keep this order.
 * [David Lynch](https://github.com/kemayo): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:kemayo), [Web](http://davidlynch.org/)
 * [David Souza](https://github.com/araujo0205): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:araujo0205), [Web](http://davidsouza.tech/)
 * [Dennis Cheng](https://github.com/den13501): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:den13501)
+* [Denys Nykula](https://github.com/nykula): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:nykula), [Web](https://libre.net.ua/)
 * [Dezponia](https://github.com/dezponia): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:dezponia)
 * [Django Janny](https://github.com/keltroth): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:keltroth)
 * [drosoCode](https://github.com/drosoCode): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:drosoCode), [Web](https://thomasz.me/)