Merge branch 'feature/42-remove-spurious-failed-0' into 'dev'

src/should.py: remove a spurious 'failed:0' with --xml

Closes #42

See merge request !17
3 jobs for dev in 13 seconds (queued for 1 second)
Status Job ID Name Coverage
  Unit
passed #296811
unit

00:00:02

 
  Demo
passed #296812
demo

00:00:04

 
  Coverage
passed #296813
coverage

00:00:06

86.0%