removing call so self.span_days as is a local variable

coordinator/ProcessorEpidemiology.py

@@ -73,7 +73,7 @@ class ProcessorEpidemiology(Processor):
         # if more than 999 days
         if len(str(span_days[0]))>3:
             # assume it is a date string
-            start_date = datetime.datetime.strptime(self.span_days[0]+'0300','%Y%m%d%H%M')
+            start_date = datetime.datetime.strptime(span_days[0]+'0300','%Y%m%d%H%M')
         else:
             date_shift0 = datetime.timedelta(days=span_days[0])