DEVELOPERS: add Gilles Talis for libosip2 and libeXosip2

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 1ce85392d051f86d32c2f34036a9f99466bcc184)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -969,7 +969,9 @@ F:	package/fdk-aac/
 F:	package/httping/
 F:	package/iozone/
 F:	package/leptonica/
+F:	package/libeXosip2/
 F:	package/libolm/
+F:	package/libosip2/
 F:	package/ocrad/
 F:	package/restclient-cpp/
 F:	package/tesseract-ocr/