Actually install the dev packages for CI

3 jobs for go-three in 1 minute and 42 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #5312
Go-py3.4

00:01:38

failed #5313
Go-py3.5

00:01:42

passed #5314
Go-py3.6

00:01:00

67.0%
 
Name Stage Failure
failed
Go-py3.5 Test

- ['David', 'Haynes']
+ ['', '']

----------------------------------------------------------------------
Ran 76 tests in 11.043s

FAILED (failures=1)
ERROR: Job failed: exit code 1