Webtest

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- Nothing changed yet.

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- Ensure BeautifulSoup 4.13+ compatibility

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- Minor release to fix metadata on pypi

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- Bump waitress min version to 3.0.2

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- Multiple file input support.

- Drop support for Python 3.8 and bellow

- Allows the TestResponse to follow customised onclick buttons

- Response.pyquery object now use the html parser.

- You can use the Response.PyQuery method to customize pyquery init.

- Various docs / testing improvments

- Rename "master" git branch to "main".

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- Dropped support for Python 2.7 and 3.5.

- Added support for Python 3.9.

- Clean up dependencies and requirements.

- Switch from Travis to GitHub Actions for building and testing.

- Prevent PytestCollectionWarning for TestApp