contrib/libosmocore.spec.in: mention osmo-config-merge in utils

Change-Id: I4d3d06b2f27ded60f9408e326202c5c6bf6d35d1
diff --git a/contrib/libosmocore.spec.in b/contrib/libosmocore.spec.in
index 3018280..c2fe738 100644
--- a/contrib/libosmocore.spec.in
+++ b/contrib/libosmocore.spec.in
@@ -54,7 +54,8 @@
 
 This package contains a program for frequency calculation for GSM
 called "osmo-arfcn", and a program called "osmo-auc-gen" that is used
-for testing GSM authentication.
+for testing GSM authentication, as well as "osmo-config-merge", a tool
+for merging Osmocom configuration files.
 
 %package -n libosmocodec0
 Summary:        GSM 06.10, 06.20, 06.60, 06.90 codec library