Add credit related to #2962 (#2965)

CREDITS.md

@@ -102,6 +102,7 @@ People are sorted by name so please keep this order.
 * [tomgue](https://github.com/tomgue): [contributions](https://github.com/FreshRSS/FreshRSS/commits?author=tomgue)
 * [Twilek-de](https://github.com/Twilek-de): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:Twilek-de)
 * [Uncovery](https://github.com/uncovery): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:uncovery)
+* [upskaling](https://github.com/upskaling): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:upskaling)
 * [Wanabo](https://github.com/Wanabo): [contributions](https://github.com/FreshRSS/FreshRSS/commits?author=Wanabo)
 * [wtoscer](https://github.com/wtoscer): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:wtoscer)
 * [Yamakuni](https://github.com/Yamakuni): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:Yamakuni), [Web](https://ofanch.me/)