Updated authors

Author: Suzanna-Volkov

AUTHORS.md

@@ -9,5 +9,6 @@
 * [mwl](https://github.com/mwl)
 * [cornet](https://github.com/cornet)
 * [michaelssingh](https://github.com/michaelssingh)
+* [joawan](https://github.com/joawan)
 
 Thanks to all who have contributed!