Add contour kwargs to plot_decision_regions.

[pbloem]

Code of Conduct

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Description

I added a kwargs keyword to control how the lines between decision regions look. I needed this for a thing, so I thought I'd make it a pull request. I think I followed the logic of the other two kwargs arguments correctly.

Related issues or pull requests

None

Pull Request Checklist

• [ ] Added a note about the modification or contribution to the ./docs/sources/CHANGELOG.md file (if applicable)
• [ ] Added appropriate unit test functions in the ./mlxtend/*/tests directories (if applicable)
• [ ] Modify documentation in the corresponding Jupyter Notebook under mlxtend/docs/sources/ (if applicable)
• [+] Ran PYTHONPATH='.' pytest ./mlxtend -sv and make sure that all unit tests pass (for small modifications, it might be sufficient to only run the specific test file, e.g., PYTHONPATH='.' pytest ./mlxtend/classifier/tests/test_stacking_cv_classifier.py -sv)
• [+] Checked for style issues by running flake8 ./mlxtend

[pep8speaks]

Hello @pbloem! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers:

Comment last updated at 2022-01-19 16:46:51 UTC

[rasbt]

Great, thanks! I don't think we'll need a doc example for that, so it should be good to merge.

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