change file name for calendar download

rowers/views.py

@@ -1947,7 +1947,12 @@ def plannedsessions_icsemail_view(request,userid=0):
 
 
     response = HttpResponse(cal.to_ical())
-    response['Content-Disposition'] = 'attachment; filename="training_plan_%s.ics"' % request.user.id
+    response['Content-Disposition'] = 'attachment; filename="training_plan_{u}_{d1}_{d2}.ics"'.format(
+        u =  request.user.username,
+        d1 = startdate.strftime("%Y%m%d"),
+        d2 = enddate.strftime("%Y%m%d"),
+        )
+        
     response['Content-Type'] = 'application/octet-stream'
 
     return response