src/should.py: update doctests

see #39
3 jobs for refactor/39-status-class in 6 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Unit
passed #1992
unit

00:00:01

 
  Demo
failed #1993
demo

00:00:04

 
  Coverage
skipped #1994
coverage
 
Name Stage Failure
failed
demo Demo
files with SKIP:
demo/requires.should
demo/unicode.should
files with
failed:
demo/retry.should
Uploading artifacts...
should.xml: found 1 matching files
Uploading artifacts to coordinator... ok
id=1993 responseStatus=201 Created token=TVQv__yK
ERROR: Job failed: exit status 1