Drop unintentional json-schema dependency

Author: silug

scelint.gemspec

@@ -27,5 +27,4 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'deep_merge', '~> 1.2'
   spec.add_dependency 'thor', '~> 1.3'
   spec.add_dependency 'compliance_engine', '>= 0.1.0', '< 0.3.0'
-  spec.add_dependency 'json-schema', '~> 5.0'
 end