Enhancement: Use ergebnis/php-cs-fixer-config

[localheinz]

This PR

• uses ergebnis/php-cs-fixer-config instead of localheinz/php-cs-fixer-config

[codecov]

Codecov Report

Merging #58 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master    #58   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity       20     20           
=======================================
  Files             1      1           
  Lines            53     53           
=======================================
  Hits             53     53

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