debian/changelog

+cmlxom (3.1-2) unstable; urgency=medium
+
+  * Adding a watch file.
+
+ -- Andrius Merkys <merkys@debian.org>  Tue, 10 Dec 2019 05:08:26 -0500
+
 cmlxom (3.1-1) unstable; urgency=medium
 
   * Initial release (Closes: #945132)

debian/watch

+version=4
+https://bitbucket.org/wwmm/cmlxom/downloads/?tab=tags \
+ (?:.*?/)?cmlxom-(\d[\d.]*)\.tar\.gz