[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

schematics 1.1.0 requires mock, which is not installed.
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
	539/1000 Why? Has a fix available, CVSS 6.5	Cross-site Scripting (XSS) SNYK-PYTHON-PYRAMID-40730	pyramid: 1.5.7 -> 1.6a2	No	No Known Exploit
	464/1000 Why? Has a fix available, CVSS 5	Timing Attack SNYK-PYTHON-PYRAMID-564353	pyramid: 1.5.7 -> 1.6a2	No	No Known Exploit
	704/1000 Why? Has a fix available, CVSS 9.8	Arbitrary Code Execution SNYK-PYTHON-PYYAML-42159	pyyaml: 3.11 -> 5.4	No	No Known Exploit
	704/1000 Why? Has a fix available, CVSS 9.8	Arbitrary Code Execution SNYK-PYTHON-PYYAML-559098	pyyaml: 3.11 -> 5.4	No	No Known Exploit
	876/1000 Why? Mature exploit, Has a fix available, CVSS 9.8	Arbitrary Code Execution SNYK-PYTHON-PYYAML-590151	pyyaml: 3.11 -> 5.4	No	Mature
	811/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 9.8	Information Exposure SNYK-PYTHON-REQUESTS-72435	requests: 2.7.0 -> 2.20	No	Proof of Concept
	479/1000 Why? Has a fix available, CVSS 5.3	HTTP Response Splitting SNYK-PYTHON-WEBOB-40490	webob: 1.4.1 -> 1.6.0a0	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 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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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Cross-site Scripting (XSS)
🦉 Arbitrary Code Execution
🦉 Arbitrary Code Execution

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This change is 

[guardrails]

⚠️ We detected 1 security issue in this pull request:

Vulnerable Libraries (1)

Severity	Details
High	pkg:pypi/[email protected]@1.6a2 - no patch available

More info on how to fix Vulnerable Libraries in Python.

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