DEVELOPERS: add myself to modem-manager

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
diff --git a/DEVELOPERS b/DEVELOPERS
index 656dead..efd331d 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -408,6 +408,7 @@
 F:	package/gtest/
 F:	package/libpam-radius-auth/
 F:	package/libpam-tacplus/
+F:	package/modem-manager/
 F:	package/perl-file-util/
 F:	package/util-linux/
 F:	package/tpm2-abrmd/