Update AUTHORS.txt

AUTHORS.txt

@@ -5,18 +5,16 @@ Founders of the project:
 	Roman Telezhynskyi <dismine@gmail.com>
 	Susan Spencer <susan.spencer@gmail.com>
 
-Maintainer of the project:
-    Susan Spencer <susan.spencer@gmail.com>
-
-Product Design and Community manager:
-	Susan Spencer <susan.spencer@gmail.com>
+Project maintainer, Product designer, Prototype developer, Community manager:
+        Susan Spencer <susan.spencer@gmail.com>
 
 Additional Contributors:
         Douglas Caskey
         Ian Cunningham
 	Bettina Gatzlaff <bettina.gatzlaff@gmail.com>
 	Marius Ghita
 	Peter Gsellmann
+	Mohammed Ibrahim
 	Mischa Krempel
 	Bojan Kverh
 	Christine Neupert <enaisoc@googlemail.com>