Moved to psr-4

[samnela]

• PSR-0 has been marked as deprecated. PSR-4 is now recommended as an alternative. https://www.php-fig.org/psr/psr-0/

[codecov]

Codecov Report

Merging #56 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master     #56   +/-   ##
========================================
  Coverage      87.2%   87.2%           
  Complexity       44      44           
========================================
  Files             1       1           
  Lines           125     125           
========================================
  Hits            109     109           
  Misses           16      16

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