Fix tutorial server data error.
Fix tutorial server data error.

Fixes influxdata/influxdb-python#213

influxdata/influxdb-python,influxdb/influxdb-python,tzonghao/influxdb-python,influxdb/influxdb-python,BenHewins/influxdb-python,omki2005/influxdb-python,tzonghao/influxdb-python,Asimmetric/influxdb-python,Asimmetric/influxdb-python,omki2005/influxdb-python,influxdata/influxdb-python,BenHewins/influxdb-python