Updated stats example

Author: thinkingserious

example_v3_test.py

@@ -13,7 +13,10 @@
 start_date = '2015-10-01'
 end_date = None
 aggregated_by = 'week' # must be day, week or month
-status, msg = client.stats.get(start_date, end_date, aggregated_by)
+status, msg = client.stats.get(
+                start_date=start_date, 
+                end_date=end_date, 
+                aggregated_by=aggregated_by)
 print status
 print msg