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 #1783
unit

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  Demo
passed #1784
demo

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  Coverage
passed #1785
coverage

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