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

@@           Coverage Diff           @@
##             master   #168   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity      128    128           
=======================================
  Files            30     30           
  Lines           394    394           
=======================================
  Hits            394    394

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