DEVELOPERS: add Heiko Thiery for package/rauc

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit 6bec87810252d123f768af03e0e2ab53d2b61f03)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1236,6 +1236,7 @@ F:	package/libnetconf2/
 F:	package/libyang/
 F:	package/linuxptp/
 F:	package/netopeer2/
+F:	package/rauc/
 F:	package/sysrepo/
 
 N:	Hervé Codina <herve.codina@bootlin.com>