DEVELOPERS: change email for Titouan Christophe

Signed-off-by: Titouan Christophe <titouanchristophe@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 92c316f2c7a17e3320d33ced50a882f89f3269b8)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -2591,7 +2591,7 @@ F:	toolchain/
 N:	Timo Ketola <timo.ketola@exertus.fi>
 F:	package/fbgrab/
 
-N:	Titouan Christophe <titouan.christophe@railnova.eu>
+N:	Titouan Christophe <titouanchristophe@gmail.com>
 F:	package/avro-c/
 F:	package/mosquitto/
 F:	package/python-avro/