Point to new GitLab.com repository location

Changelog

@@ -1,7 +1,7 @@
 For the latest changes please refer to the output of `git log` or the
 on-line log at:
 
-      https://alioth.debian.org/plugins/scmgit/cgi-bin/gitweb.cgi?p=sane/sane-frontends.git;a=log
+      https://gitlab.com/sane-project/frontends/commits/master
 
 Note to developers:
       For 1.0.15 and beyond we will generate the ChangeLog from the git