Enhancement: Synchronize with ergebnis/php-library-template

[localheinz]

This PR

• synchronizes with ergebnis/php-library-template

[codecov]

Codecov Report

Merging #86 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #86   +/-   ##
=========================================
  Coverage     93.50%   93.50%           
  Complexity       75       75           
=========================================
  Files             8        8           
  Lines           200      200           
=========================================
  Hits            187      187           
  Misses           13       13           

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