[Snyk] Fix for 2 vulnerabilities

[robdyke]

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

format 4.4.0 requires jupyter-core, which is not installed.
nbconvert 5.4.1 requires jupyter-core, which is not installed.
django-js-asset 2.0.0 has requirement Django>=2.2, but you have Django 2.1.15.

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Important

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