composer.json: move nikic/php-parser into dev dependencies

[voku]

ref.: #59

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.89%. Comparing base (3cafd8c) to head (c8fa4ac).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #60   +/-   ##
=========================================
  Coverage     97.89%   97.89%           
  Complexity      149      149           
=========================================
  Files            15       15           
  Lines           332      332           
=========================================
  Hits            325      325           
  Misses            7        7           

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[voku]

I think the composer-require-checker check --config-file=$(realpath composer-require-checker.json) command is not working here, because it's a extension for a phar file and that can't be checked.

[Slamdunk]

Then please add it to the ignore list

[Slamdunk]

Thank you 👍