[Snyk] Security upgrade markdown2 from 2.4.13 to 2.5.1

[p0psicles]

Snyk has created this PR to fix 2 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• requirements.txt

⚠️ Warning

knowit 0.4.0 requires pint, which is not installed.
knowit 0.4.0 requires pymediainfo, which is not installed.
knowit 0.4.0 requires PyYAML, which is not installed.

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• This PR was automatically created by Snyk using the credentials of a real user.
• 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 affected dependencies could be upgraded.

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