Add Richard Olszynský to CREDITS.md (#9549)

Follow-up to #9518.

CREDITS.md

@@ -314,6 +314,7 @@ People are sorted by name so please keep this order.
 * [Rebecca Scott](https://github.com/becdetat): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:becdetat), [Web](https://becdetat.com)
 * [Rezad](https://github.com/rezad1393): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:rezad1393)
 * [Ricardo Simões](https://github.com/Ricardo-Simoes): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:Ricardo-Simoes)
+* [Richard Olszynský](https://github.com/turboflexer): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:turboflexer)
 * [rid3r45](https://github.com/rid3r45): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:rid3r45)
 * [Rob Loach](https://github.com/RobLoach): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:RobLoach), [Web](https://robloach.net/)
 * [Robert Kaussow](https://github.com/xoxys): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:xoxys), [Web](https://thegeeklab.de/)