[Snyk] Fix for 3 vulnerabilities

[snyk-bot]

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-dev.txt

⚠️ Warning

``` pylint-plugin-utils 0.6 requires pylint, which is not installed. pylint-django 2.3.0 requires pylint, which is not installed. ```

Vulnerabilities that will be fixed

By pinning:

Severity	Issue	Upgrade	Breaking Change	Exploit Maturity
	SQL Injection SNYK-PYTHON-DJANGODEBUGTOOLBAR-1246398	django-debug-toolbar: 3.2 -> 3.2.1	No	No Known Exploit
	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-PYLINT-1089548	pylint: 2.6.0 -> 2.7.0	No	No Known Exploit
	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-PYLINT-609883	pylint: 2.6.0 -> 2.7.0	No	No Known Exploit

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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[codecov[bot]]

Codecov Report

Merging #103 (9810837) into master (9150f2d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #103   +/-   ##
=======================================
  Coverage   62.61%   62.61%           
=======================================
  Files         132      132           
  Lines        4917     4917           
=======================================
  Hits         3079     3079           
  Misses       1838     1838           

Flag	Coverage Δ
unittests	62.61% <ø> (ø)

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