docs: fix simple typo, reponse -> response (influxdata#873)

There is a small typo in influxdb/tests/client_test.py.

Should read `response` rather than `reponse`.

Author: timgates42

influxdb/tests/client_test.py

@@ -1398,7 +1398,7 @@ def test_invalid_port_fails(self):
             InfluxDBClient('host', '80/redir', 'username', 'password')
 
     def test_chunked_response(self):
-        """Test chunked reponse for TestInfluxDBClient object."""
+        """Test chunked response for TestInfluxDBClient object."""
         example_response = \
             u'{"results":[{"statement_id":0,"series":[{"columns":["key"],' \
             '"values":[["cpu"],["memory"],["iops"],["network"]],"partial":' \