Add Cron to CREDITS (#9068)

As requested in #9065, adding myself to the contributors list.
Inserted alphabetically. Contribution: #9065 (stop the unread-count poller after the session ends).

CREDITS.md

@@ -65,6 +65,7 @@ People are sorted by name so please keep this order.
 * [Corentin Garcia](https://github.com/corenting): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:corenting), [Web](http://corenting.fr/)
 * [Craig Andrews](https://github.com/candrews): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:candrews), [Web](http://candrews.integralblue.com/)
 * [Creak](https://github.com/MightyCreak): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is%3Apr+author%3AMightyCreak)
+* [Cron](https://github.com/featurecreep-cron): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:featurecreep-cron)
 * [Crupuk](https://github.com/Crupuk): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:Crupuk)
 * [Cyb10101](https://github.com/Cyb10101): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:Cyb10101)
 * [Damien Leroy](https://github.com/ShiiFu): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:ShiiFu)