heartcheck.gemspec in heartcheck-1.6.0 vs heartcheck.gemspec in heartcheck-2.0.0

@@ -1,6 +1,8 @@
-lib = File.expand_path('../lib', __FILE__)
+# frozen_string_literal: true
+
+lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'heartcheck/version'
 
 Gem::Specification.new do |spec|
   spec.name = 'heartcheck'
@@ -8,27 +10,31 @@
   spec.authors = ['Locaweb']
   spec.email = ['[e-mail]']
   spec.homepage = 'http://github.com/locaweb/heartcheck/'
   spec.summary = 'A simple way to check if your app is runnig like as expected.'
   spec.description = 'A simple way to check your app heart.'
-  spec.license =  'MIT'
+  spec.license = 'MIT'
 
-  spec.files = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
-  spec.bindir = "exe"
+  spec.files = `git ls-files -z`.split("\x0").reject do |f|
+    f.match(%r{^(test|spec|features)/})
+  end
+  spec.bindir = 'exe'
   spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
-  spec.require_paths = ["lib"]
+  spec.require_paths = ['lib']
 
-  spec.add_runtime_dependency 'rack', '>= 1.4.0', '< 2.1'
+  spec.required_ruby_version = '>= 2.3'
+
   spec.add_runtime_dependency 'multi_json', '~> 1.0'
   spec.add_runtime_dependency 'net-telnet', '~> 0.1.1'
+  spec.add_runtime_dependency 'rack', '~> 2.2'
   spec.add_runtime_dependency 'sys-uname', '~> 1.0', '>= 1.0.3'
 
-  spec.add_development_dependency 'rake'
+  spec.add_development_dependency 'concurrent-ruby', '~> 1.0.2'
+  spec.add_development_dependency 'oj', '~> 2.18'
   spec.add_development_dependency 'pry-nav', '~> 0.2.4'
+  spec.add_development_dependency 'rack-test', '~> 1.1'
+  spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rspec', '~> 3.5.0'
   spec.add_development_dependency 'rubocop'
   spec.add_development_dependency 'thor', '~> 0.19.1'
-  spec.add_development_dependency 'rack-test', '~> 0.6.3'
-  spec.add_development_dependency 'oj', '~> 2.18'
   spec.add_development_dependency 'yard', '~> 0.9.5'
-  spec.add_development_dependency 'concurrent-ruby', '~> 1.0.2'
 end