[Snyk] Fix for 7 vulnerabilities

[kroman0]

This PR was automatically created by Snyk using the credentials of a real user.

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

python-coveralls 2.5.0 requires coverage, which is not installed.
gevent 1.1rc5 requires greenlet, which is not installed.
Babel 2.9.1 has requirement pytz>=2015.7, but you have pytz 2014.10.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	586/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-JINJA2-1012994	jinja2: 2.7.3 -> 2.11.3	No	Proof of Concept
	514/1000 Why? Has a fix available, CVSS 6	Sandbox Escape SNYK-PYTHON-JINJA2-174126	jinja2: 2.7.3 -> 2.11.3	No	No Known Exploit
	644/1000 Why? Has a fix available, CVSS 8.6	Sandbox Bypass SNYK-PYTHON-JINJA2-455616	jinja2: 2.7.3 -> 2.11.3	No	No Known Exploit
	696/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-PYGMENTS-1086606	pygments: 2.0.2 -> 2.7.4	No	Proof of Concept
	589/1000 Why? Has a fix available, CVSS 7.5	Denial of Service (DoS) SNYK-PYTHON-PYGMENTS-1088505	pygments: 2.0.2 -> 2.7.4	No	No Known Exploit
	736/1000 Why? Currently trending on Twitter, Mature exploit, Has a fix available, CVSS 6.5	Cross-site Scripting (XSS) SNYK-PYTHON-SPHINX-570772	sphinx: 1.3.1 -> 3.0.4	No	Mature
	726/1000 Why? Currently trending on Twitter, Mature exploit, Has a fix available, CVSS 6.3	Cross-site Scripting (XSS) SNYK-PYTHON-SPHINX-570773	sphinx: 1.3.1 -> 3.0.4	No	Mature

(*) 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 affected dependencies could be upgraded.

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

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🦉 Regular Expression Denial of Service (ReDoS)
🦉 Regular Expression Denial of Service (ReDoS)
🦉 Denial of Service (DoS)
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