Updated doctest's output to reflect error message found in summer 2019.

Christopher Bohnrequested to merge
bohn/unittest_and_doctest:patch-1 into master
  • When running doctest for parse('invalid'):
    • error message encountered during lesson prep for soft 162 was different than error message in doctest
    • changed doctest to reflect current error message
  • Possible discussion point for future is that error messages may change in future versions of Python, causing false-failures of tests

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