Update CONTRIBUTORS.md

Author: SecondeJK

CONTRIBUTORS.md

@@ -18,6 +18,7 @@ In no particular order, we would like to thank all the contributors who have
 helped work on this library. We truly value our open source community and the
 work that they do.
 
+* [Aleksandr Demchenko](https://github.com/stronglab)
 * [Ash Allen](https://github.com/ash-jc-allen)
 * [Thiago Locks](https://github.com/thiagolcks)
 * [Derick Rethans](https://github.com/derickr)