DEVELOPERS: update email for flatcc

Signed-off-by: Joel Carlson <JoelsonCarl@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -959,7 +959,7 @@ F:	package/batctl/
 N:	Jeremy Rosen <jeremy.rosen@openwide.fr>
 F:	package/fxload/
 
-N:	Joel Carlson <joel.carlson@cosmicaes.com>
+N:	Joel Carlson <JoelsonCarl@gmail.com>
 F:	package/flatcc/
 
 N:	Joel Stanley <joel@jms.id.au>