Remove leftover debug print()

Noticed it while running tox with the recently added tests.
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>

patchwork/views/series.py

@@ -77,9 +77,6 @@ class SeriesView(View):
         cover_letters = [(r.version, r.cover_letter)
                 for r in revisions if r.cover_letter]
 
-        for rev in revisions:
-            print(rev.skip_requester)
-
         return render(request, 'patchwork/series.html', {
             'series': series,
             'project': project,