Depend on everit-json-schema from Maven Central instead of JitPack

[RustedBones]

[codecov-commenter]

Codecov Report

Merging #157 (55c7f1e) into master (07604ae) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 55c7f1e differs from pull request most recent head 33c0c27. Consider uploading reports for the commit 33c0c27 to get more accurate results

@@            Coverage Diff            @@
##            master      #157   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           35        35           
  Branches         4         2    -2     
=========================================
  Hits            35        35           

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