debian/control: change maintainer to the Osmocom team / mailing list

Change-Id: Ia340c28169c8bfd07c37d320c3f5386a06e4c092
diff --git a/debian/control b/debian/control
index ac2dd6a..381e291 100644
--- a/debian/control
+++ b/debian/control
@@ -1,5 +1,5 @@
 Source: libosmocore
-Maintainer: Harald Welte <laforge@gnumonks.org>
+Maintainer: Osmocom team <openbsc@lists.osmocom.org>
 Section: libs
 Priority: optional
 Build-Depends: debhelper (>= 9),