[Snyk] Fix for 1 vulnerabilities

[jank]

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	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	658/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-JINJA2-1012994	jinja2: 2.10.1 -> 2.11.3 Jinja2: 2.10.1 -> 2.11.3	No	Proof of Concept

(*) 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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Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

For more information:
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[coveralls]

Coverage remained the same at 97.309% when pulling 9aeb00b on snyk-fix-bb4eeb8f985dbfbe06df5ee31ff9693c into 7153ab5 on master.