[Snyk] Security upgrade sphinx from 1.7.5 to 3.0.4

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `pip` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • requirements.txt

Vulnerabilities that will be fixed

By pinning:

Severity	Issue	Upgrade	Breaking Change	Exploit Maturity
	Cross-site Scripting (XSS) SNYK-PYTHON-SPHINX-570772	sphinx: 1.7.5 -> 3.0.4	No	No Known Exploit
	Cross-site Scripting (XSS) SNYK-PYTHON-SPHINX-570773	sphinx: 1.7.5 -> 3.0.4	No	No Known Exploit

Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the effected dependencies could be upgraded.

Check the changes in this PR to ensure they won't cause issues with your project.

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📚 Read more about Snyk's upgrade and patch logic

[codecov[bot]]

Codecov Report

Merging #162 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #162   +/-   ##
=======================================
  Coverage   92.48%   92.48%           
=======================================
  Files          14       14           
  Lines        1649     1649           
  Branches      274      274           
=======================================
  Hits         1525     1525           
  Misses        101      101           
  Partials       23       23           

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