DEVELOPERS: add Julien Olivain for package/gnupg2

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1682,6 +1682,7 @@ F:	configs/spike_riscv64_defconfig
 F:	configs/zynq_qmtech_defconfig
 F:	package/fluid-soundfont/
 F:	package/fluidsynth/
+F:	package/gnupg2/
 F:	package/glslsandbox-player/
 F:	package/octave/
 F:	package/ola/