Update contributors

CONTRIBUTORS

@@ -1,10 +1,13 @@
 Special thanks for all the people who had helped this project:
 
 DevelopRepo <[email protected]>
+Mauricio Ferrari <[email protected]>
 Alexander Ivash <[email protected]>
 Longshan Du <[email protected]>
 Dniester Amorim <[email protected]>
 Gilles Caulier <[email protected]>
+Niko Križnik <[email protected]>
 Novacer <[email protected]>
 Transporter <[email protected]>
 leavelet <[email protected]>
+xdcsystems <[email protected]>