[Snyk] Security upgrade pylint from 2.5.0 to 2.6.1

[suddi]

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:
  • test_requirements.txt

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	630/1000 Why? Has a fix available, CVSS 8.1	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-PYLINT-609883	pylint: 2.5.0 -> 2.6.1	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

[codecov]

Codecov Report

Merging #9 (a21982e) into master (f31b537) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #9 +/- ##
=========================================
Coverage 100.00% 100.00% =========================================
Files 4 4 Lines 83 83 Branches 14 14 =========================================
Hits 83 83 

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