fix: specify package requirements in setup.py

[bednar]

Closes #229

Proposed Changes

Move requirements definition into setup.py - it is best practice for library according to https://packaging.python.org/discussions/install-requires-vs-requirements/.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• pytest tests completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov]

Codecov Report

Merging #232 (00e3980) into master (e5d3543) will increase coverage by 0.77%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #232      +/-   ##
==========================================
+ Coverage   90.99%   91.76%   +0.77%     
==========================================
  Files          26       25       -1     
  Lines        2020     2003      -17     
==========================================
  Hits         1838     1838              
+ Misses        182      165      -17     

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