[Snyk] Security upgrade cryptography from 2.2.2 to 3.3.2

[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

⚠️ Warning

cryptography 3.3.2 has requirement cffi>=1.12, but you have cffi 1.11.5.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	581/1000 Why? Recently disclosed, Has a fix available, CVSS 5.9	Cryptographic Issues SNYK-PYTHON-CRYPTOGRAPHY-1070544	cryptography: 2.2.2 -> 3.3.2	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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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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📚 Read more about Snyk's upgrade and patch logic

[coveralls]

Coverage remained the same at 100.0% when pulling daeb4d6 on snyk-fix-f83d924d69e75e907c3aaec5c076ffef into 1b08298 on master.