Adding myself as a contributor

CREDITS.md

@@ -19,6 +19,7 @@ People are sorted by name so please keep this order.
 * [danc](https://github.com/danc): [contributions](https://github.com/FreshRSS/FreshRSS/commits?author=danc), [Web](http://tintouli.free.fr/)
 * [David Souza](https://github.com/araujo0205): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:araujo0205), [Web](http://davidsouza.tech/)
 * [dswd](https://github.com/dswd): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:dswd)
+* [Django Janny](https://github.com/keltroth): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:keltroth)
 * [ealdraed](https://github.com/ealdraed): [contributions](https://github.com/FreshRSS/FreshRSS/commits?author=ealdraed)
 * [Frans de Jonge](https://github.com/Frenzie): [contributions](https://github.com/FreshRSS/FreshRSS/commits?author=Frenzie), [Web](http://fransdejonge.com/)
 * [gsongsong](https://github.com/gsongsong): [contributions](https://github.com/FreshRSS/FreshRSS/pulls?q=is:pr+author:gsongsong)