Enhancement: Add support for PHP 8.0

[localheinz]

This PR

• adds support for PHP 8.0

[codecov]

Codecov Report

Merging #177 into main will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #177   +/-   ##
=========================================
  Coverage     98.87%   98.87%           
  Complexity       58       58           
=========================================
  Files            14       14           
  Lines           178      178           
=========================================
  Hits            176      176           
  Misses            2        2           

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