Fix more rubocop violations

[bastelfreak]

No description provided.

[bastelfreak]

we agreed on using those in voxpupuli/voxpupuli-test#86

[codecov]

Codecov Report

Base: 89.99% // Head: 89.99% // No change to project coverage 👍

Coverage data is based on head (9437acd) compared to base (d3d90ec).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 9437acd differs from pull request most recent head 42b9a88. Consider uploading reports for the commit 42b9a88 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #484   +/-   ##
=======================================
  Coverage   89.99%   89.99%           
=======================================
  Files          76       76           
  Lines        1579     1579           
=======================================
  Hits         1421     1421           
  Misses        158      158           

Impacted Files	Coverage Δ
lib/json-schema/attributes/type_v4.rb	100.00% <ø> (ø)
lib/json-schema/validators/draft1.rb	100.00% <ø> (ø)
lib/json-schema/validators/draft2.rb	100.00% <ø> (ø)
lib/json-schema/validators/draft3.rb	100.00% <ø> (ø)
lib/json-schema/validators/draft4.rb	100.00% <ø> (ø)
lib/json-schema/validators/draft6.rb	100.00% <ø> (ø)
lib/json-schema/attribute.rb	100.00% <100.00%> (ø)
lib/json-schema/attributes/allof.rb	95.00% <100.00%> (ø)
lib/json-schema/attributes/anyof.rb	100.00% <100.00%> (ø)
lib/json-schema/attributes/extends.rb	74.19% <100.00%> (ø)
... and 9 more

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