Facilitate future releases

* use release helper from libosmocore
* use semantic versioning

Change-Id: Ie0a7f5977550bd0a1ba8b03bdb7e2d619a398e4e
Related: OS#1861
diff --git a/debian/changelog b/debian/changelog
index 7b7b4ad..6a534b4 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,4 +1,4 @@
-osmo-pcu (0.3) UNRELEASED; urgency=medium
+osmo-pcu (0.3.0) UNRELEASED; urgency=medium
 
   * Initial release.