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>
(cherry picked from commit cd9ffd94737ce76664394972dbcdce2828f5e0f6)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1902,7 +1902,7 @@ 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/