fixed rubocop

Author: sanzmauro

splitclient-rb.gemspec

@@ -44,7 +44,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake', '~> 12.3'
   spec.add_development_dependency 'rake-compiler', '~> 1.1'
   spec.add_development_dependency 'rspec', '~> 3.10'
-  spec.add_development_dependency 'rubocop', '~> 0.59'
+  spec.add_development_dependency 'rubocop', '0.59.0'
   spec.add_development_dependency 'simplecov', '~> 0.20'
   spec.add_development_dependency 'simplecov-json', '~> 0.2'
   spec.add_development_dependency 'timecop', '~> 0.9'