churn: specify unit for ui.progress when analyzing revisions

hgext/churn.py

@@ -94,7 +94,8 def countrate(ui, repo, amap, *pats, **o
             rate[key] = [r + l for r, l in zip(rate.get(key, (0, 0)), lines)]
 
         state['count'] += 1
-        ui.progress(_('analyzing'), state['count'], total=len(repo))
+        ui.progress(_('analyzing'), state['count'], total=len(repo),
+                    unit=_('revisions'))
 
     for ctx in cmdutil.walkchangerevs(repo, m, opts, prep):
         continue