[Snyk] Security upgrade nltk from 3.5 to 3.6

[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

⚠️ Warning

pymdown-extensions 8.0 has requirement Markdown>=3.2, but you have Markdown 3.1.1.
mkdocs-minify-plugin 0.3.0 requires mkdocs, which is not installed.
mkdocs-material 5.5.8 requires mkdocs-material-extensions, which is not installed.
mkdocs-material 5.5.8 requires mkdocs, which is not installed.
mkdocs-material 5.5.8 requires Pygments, which is not installed.
livereload 2.6.1 requires tornado, which is not installed.
importlib-metadata 1.7.0 requires zipp, which is not installed.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	479/1000 Why? Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-NLTK-1053952	nltk: 3.5 -> 3.6	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

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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