Add current documentation contributers (#3283)

Alexandre Neto,
Harrissou Sant-anna
Yves Jacolin

doc/CONTRIBUTORS

@@ -5,6 +5,7 @@
 # QGIS:
 #
 Alessandro Pasotti
+Alexandre Neto
 Andres Manz
 Anita Graser
 Arthur Nanni
@@ -34,6 +35,7 @@ Frank Warmerdam
 Germán Carrillo
 Giovanni Manghi
 Giuseppe Sucameli
+Harrissou Sant-anna
 Horst Duester
 Hyao (IRC nickname)
 Ivan Lucena
@@ -75,5 +77,6 @@ Tom Russo
 Tyler Mitchell
 Vita Cizek
 Yann Chemin
+Yves Jacolin
 
 Includes Map icons CC-0 from SJJB Management