Technical/Update gem development dependencies (#24)

Author: bestwebua

.circleci/gemspecs/latest

@@ -28,6 +28,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rspec', '~> 3.13'
   spec.add_development_dependency 'rubocop', '~> 1.62', '>= 1.62.1'
   spec.add_development_dependency 'rubocop-performance', '~> 1.21'
-  spec.add_development_dependency 'rubocop-rspec', '= 2.27.1'
+  spec.add_development_dependency 'rubocop-rspec', '~> 2.28'
   spec.add_development_dependency 'simplecov', '~> 0.22.0'
 end