issue-129: Add uvicorn workers env variable and add to CHANGELOG "backward compatibility break" information

[PetrS12]

closes #129

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #131 (b036736) into develop (f960ed4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #131   +/-   ##
========================================
  Coverage    99.03%   99.03%           
========================================
  Files            9        9           
  Lines          311      311           
  Branches        44       44           
========================================
  Hits           308      308           
  Misses           2        2           
  Partials         1        1           

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