fixed the typo!

4 jobs for typo in 1 minute and 55 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed Go-py2.7 #2550

00:01:53

passed Go-py3.4 #2551

00:01:55

passed Go-py3.5 #2552

00:01:53

passed Go-py3.6 #2553

00:01:53