Drop Ruby 2.5/2.6 & switch to voxpupuli-rubocop

[bastelfreak]

No description provided.

[codecov]

Codecov Report

Patch coverage: 20.00% and project coverage change: +0.69% 🎉

Comparison is base (b89f021) 45.16% compared to head (d7013f8) 45.85%.

❗ Current head d7013f8 differs from pull request most recent head a490d1d. Consider uploading reports for the commit a490d1d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
+ Coverage   45.16%   45.85%   +0.69%     
==========================================
  Files           4        4              
  Lines         186      181       -5     
==========================================
- Hits           84       83       -1     
+ Misses        102       98       -4     

Files Changed	Coverage Δ
lib/metadata-json-lint/rake_task.rb	0.00% <0.00%> (ø)
lib/metadata-json-lint/schema.rb	70.37% <0.00%> (ø)
lib/metadata_json_lint.rb	39.31% <18.18%> (+0.47%)	⬆️
lib/metadata-json-lint/version_requirement.rb	62.06% <50.00%> (-2.22%)	⬇️

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.