adding myself to AUTHORS as per commits (#1109)

commits:
ff92365
5907cef

Author: stefanofiorentino

AUTHORS

@@ -97,6 +97,7 @@ selaselah <[email protected]>
 Sergiy80 <[email protected]>
 sergzub <[email protected]>
 Stefan Schweter <[email protected]>
+Stefano Fiorentino <[email protected]>
 Steffen Kieß <[email protected]>
 Steven Hahn <[email protected]>
 Stuart Eichert <[email protected]>