Add pyod.__version__ property

[SebastianSchmidl]

PyOD has no pyod.__version__ property, which makes integrating it in other packages complicated. Many tools use <module>.__version__ to check compatibility at runtime.

PyOD already stores the version number in code, but in a non-standard location (pyod.version.__version__). This PR just pulls the __version__ in the module's global namespace.

All Submissions Basics:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
  There is Added automatic generation of the __version__ attribute. #295, which is open for 3 years and entirely changes the versioning of PyOD.
  In contrast, this PR is a minor change.
• Have you checked all Issues to tie the PR to a specific one?
  Fixes pyod does not have a __version__ #253

[yzhao062]

thank you -- please resubmit it to the development branch.

[coveralls]

Pull Request Test Coverage Report for Build 9328842990

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 93.931%

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Totals
Change from base Build 9328611316:	0.001%
Covered Lines:	9394
Relevant Lines:	10001

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💛 - Coveralls