validates_cnpj.gemspec in validates_cnpj-2.0.1 vs validates_cnpj.gemspec in validates_cnpj-3.0.0

@@ -1,24 +1,30 @@
-# -*- encoding: utf-8 -*-
-require File.expand_path('../lib/validates_cnpj/version', __FILE__)
+# frozen_string_literal: true
 
+require File.expand_path('lib/validates_cnpj/version', __dir__)
+
 Gem::Specification.new do |gem|
   gem.name        = 'validates_cnpj'
   gem.version     = ValidatesCnpj::VERSION
-  gem.authors     = %q{Paulo Henrique Lopes Ribeiro}
-  gem.email       = %q{[e-mail]}
-  gem.summary     = %q{Validates CNPJ and test it with matchers in a simple way.}
+  gem.authors     = 'Paulo Henrique Lopes Ribeiro'
+  gem.email       = '[e-mail]'
+  gem.summary     = 'Validates CNPJ and test it with matchers in a simple way.'
 
   gem.files         = `git ls-files`.split("\n")
   gem.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
-  gem.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
-  gem.require_paths = %w(lib)
+  gem.executables   = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }
+  gem.require_paths = %w[lib]
 
+  gem.required_ruby_version = '>= 2.2'
+
   gem.license = 'MIT'
 
+  gem.add_development_dependency 'coveralls'
+  gem.add_development_dependency 'jazz_fingers', '< 5.0.0'
   gem.add_development_dependency 'rake'
   gem.add_development_dependency 'rspec'
-  gem.add_development_dependency 'shoulda-matchers', '2.0.0'
-  gem.add_development_dependency 'coveralls'
+  gem.add_development_dependency 'rubocop'
+  gem.add_development_dependency 'rubocop-rspec'
+  gem.add_development_dependency 'shoulda-matchers'
 
-  gem.add_runtime_dependency 'activemodel'
+  gem.add_runtime_dependency 'activemodel', '> 4.0', '< 6.0'
 end