move to release 0.4.0b4

3 jobs for 0.4 in 4 minutes and 2 seconds (queued for 3 minutes and 38 seconds)
Name Stage Failure
failed
test:python3.5-stretch-pyqt5 Test
 x: array([2, 2, 2, 2, 2])
y: array([1, 1, 1, 1, 1])

----------------------------------------------------------------------
Ran 21 tests in 4.230s

FAILED (failures=1)
Cleaning up file based variables
ERROR: Job failed: exit code 1