rename the branch 'master' to 'main'

[sklin93]

Please see #253 regarding renaming the default branch.

[google-cla]

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[codesue]

Hi @sklin93, thank you for this contribution! As google-cla bot mentioned, please sign a Contributor License Agreement (CLA) so we can take a look at your pull request. View this CLA check summary for more information.

[sklin93]

CLA signed! Please review and approve the pull request, thank you @codesue

[codesue]

Thank you for working on this! Looks good in general, with a couple more places to update before merging:

• contributing guide (rebase for newer version)
• pull request template
• Scikit Learn demo notebook
• Standalone demo notebook

[review-notebook-app]

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[sklin93]

Thank you for working on this! Looks good in general, with a couple more places to update before merging:

• contributing guide (rebase for newer version)
• pull request template
• Scikit Learn demo notebook
• Standalone demo notebook

Thank you for checking! All changed. @codesue