Include all contributors (#42)

Author: gahjelle

AUTHORS.md

@@ -12,6 +12,7 @@
 
 - [Jan Freyberg](https://github.com/janfreyberg)
 - [Alkatar21](https://github.com/alkatar21)
-
+- [D.C. Hess](https://github.com/dchess)
+- [Mischa Lisovyi](https://github.com/mlisovyi)
 
 See the [changelog](https://github.com/realpython/codetiming/blob/master/CHANGELOG.md) for more details.