DEVELOPERS: update Nicolas Serafini e-mail address

Signed-off-by: Nicolas Serafini <nicolas.serafini@ik.me>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

DEVELOPERS

@@ -1946,7 +1946,7 @@ F:	package/php-xdebug/
 N:	Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
 F:	package/libgit2/
 
-N:	Nicolas Serafini <nicolas.serafini@sensefly.com>
+N:	Nicolas Serafini <nicolas.serafini@ik.me>
 F:	package/exiv2/
 F:	package/ofono/