Add PHP8 support

Codecov Report

Merging #40 (749703d) into master (7a42976) will increase coverage by 0.10%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #40      +/-   ##
============================================
+ Coverage     94.52%   94.63%   +0.10%     
  Complexity       80       80              
============================================
  Files             7        7              
  Lines           201      205       +4     
============================================
+ Hits            190      194       +4     
  Misses           11       11              

Impacted Files	Coverage Δ	Complexity Δ
src/LogMiddleware.php	100.00% <0.00%> (ø)	13.00% <0.00%> (ø%)

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