[docs] In an unittest documentation example, __version__ is not PEP 396

[Robert Vanden Eynde]

Hello, in an example in

https://docs.python.org/3.8/library/unittest.html#skipping-tests-and-expected-failures

One could read

@unittest.skipIf(mylib.__version__ < (1, 3),
                     "not supported in this library version")


However, PEP 396 indicates "__version__ number SHOULD be a string", therefore the example is against a good python practice, and package manager like me would loose time googling the what the good practice is.

I suggest changing the example to skipIf(mylib.version_info < (1, 3), ...).

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