Merge branch 'master' into development

Author: jacalata

tableauserverclient/models/interval_item.py

@@ -319,4 +319,4 @@ def interval(self, interval_values):
         self._interval = interval_values
 
     def _interval_type_pairs(self):
-        return [(IntervalItem.Occurrence.MonthDay, self.interval)]
+        return [(IntervalItem.Occurrence.MonthDay, str(day)) for day in self.interval]