Add vcs-browser URL

mkit.ini

     pkgname    = jats-preupgrade-assistant
     version    = 0.0.3
     maintainer = Alois Mahdal <amahdal@redhat.com>
+    vcs-browser = https://pagure.io/jats-preupgrade-assistant
 
 [macros]
     __JATS_SUITENAME__ = preupgrade-assistant