Update sphinx-autobuild requirement from <2020.10,>=0.7 to >=0.7,<2021.4

[dependabot-preview]

Updates the requirements on sphinx-autobuild to permit the latest version.

Changelog

Sourced from sphinx-autobuild's changelog.

Changelog

unreleased

• Change output handling for subprocesses.
• Present helpful error message when the subprocesses fail.
• Skip the main sphinx build, if pre-build commands fail.

2020.09.01 - 2020-09-01

• Adopt Calendar Versioning.
• Modernize codebase and require Python 3.6+.
• Directly depend on sphinx.
• Rewritten documentation.
• Invoke sphinx via {sys.executable} -m sphinx instead of sphinx-build.
• Trim dependencies down to only livereload and sphinx.
• Drop custom adapter for watchdog.
• Drop --poll flag.
• Drop single letter variants for flags that were specific to sphinx-autobuild.

0.7.1 - 2017/07/05

• Remove spurious virtualenv directory from published packages.

0.7.0 - 2017/07/05

• Add support for python 3.5, 3.6 and deprecate official python 2.6 support.
• Add __main__ module for python 3.
• Add a --version argument.

0.6.0 – 2016/02/14

• Support -p 0, --port=0 to automatically chose an available port.
• Added -B, --open-browser to automatically open the documentation upon build.
• Added Kate swap files to the list of files ignored by default
• Automatically build docs on startup (can be disabled with --no-initial).
• Added --poll to force polling the FS for changes (useful for networked/virtualized mountpoints).
• Compatibility with livereload >= 2.4.1.

0.5.2 – 2015/04/10

• Added -r, --re-ignore command line argumet to exclude paths using regexes.

... (truncated)

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