Fix bad type of default value

data_quality/tasks/aggregate.py

@@ -39,7 +39,7 @@ def __init__(self, config, **kwargs):
         self.timestamp = datetime.datetime.now(pytz.utc)
         self.max_score = 10
         self.assess_timeliness = self.config['assess_timeliness']
-        self.timeliness_period = self.config['timeliness'].get('timeliness_period', '1')
+        self.timeliness_period = self.config['timeliness'].get('timeliness_period', 1)
         required_resources = [self.result_file, self.source_file,
                               self.publisher_file, self.run_file]
         datapackage_check.check_database_completeness(required_resources)