[CHANGE] Moved the build process to PEP 621 / pyproject.toml

[ppfeufer]

Description

Changed

• Moved the build process to PEP 621 / pyproject.toml

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented on my code, particularly in hard-to-understand areas
• [x] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #64 (14e8016) into development (565af46) will increase coverage by 0.30%. The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development      #64      +/-   ##
===============================================
+ Coverage        81.51%   81.81%   +0.30%     
===============================================
  Files               10       10              
  Lines              119      121       +2     
  Branches             6        6              
===============================================
+ Hits                97       99       +2     
  Misses              20       20              
  Partials             2        2              

Impacted Files	Coverage Δ
timezones/__init__.py	100.00% <100.00%> (ø)

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