Merge `develop` into `master`

[kjczarne]

List all Issues this Pull Request is meant to solve: N/A

Run through our contribution checklist:

• [x] Have you read kalash/doc/contributing.md?
• [x] Have you added tests for the implemented feature/fixed bug?
• [x] Have you ran a full test suite (nox -e test)?
• [x] Have you checked if the test coverage is at least 85%?
• [x] Have you ran code style check (flake8)?
• [x] Have you documented the change?
• [x] Have you updated CHANGELOG.md?

Describe shortly the changes you have introduced: Merging develop into master in preparation for v4.0.0 release.

Add additional comments (if any): N/A

[codecov-commenter]

Codecov Report

Merging #13 (1e7568b) into master (6ff2f86) will increase coverage by 0.43%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   76.08%   76.52%   +0.43%     
==========================================
  Files          14       14              
  Lines         803      818      +15     
==========================================
+ Hits          611      626      +15     
  Misses        192      192              

Impacted Files	Coverage Δ
kalash/collectors.py	91.42% <ø> (ø)
kalash/last_result_filter.py	26.19% <ø> (ø)
kalash/config.py	92.12% <100.00%> (+0.09%)	:arrow_up:
kalash/log.py	93.82% <100.00%> (+1.07%)	:arrow_up:
kalash/test_case.py	73.52% <100.00%> (+0.80%)	:arrow_up:

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