package/fb-test-app: Add myself to DEVELOPERS

Add myself to DEVELOPERS as maintainer of fb-test-app.

Suggested-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit b805e9d53656d8f2b999a651a6941f8a39dffbef)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -181,6 +181,9 @@ F:	package/sshguard/
 F:	package/sunwait/
 F:	package/sysdig/
 
+N:	Andy Shevchenko <andy.shevchenko@gmail.com>
+F:	package/fb-test-app/
+
 N:	Anisse Astier <anisse@astier.eu>
 F:	package/go/
 F:	package/nghttp2/