config.gemspec in config-2.0.0 vs config.gemspec in config-2.1.0

@@ -5,46 +5,52 @@
 Gem::Specification.new do |s|
   s.name             = 'config'
   s.version          = Config::VERSION
   s.date             = Time.now.strftime '%F'
   s.authors          = ['Piotr Kuczynski', 'Fred Wu', 'Jacques Crocker']
-  s.email            = %w([e-mail] [e-mail] [e-mail])
+  s.email            = %w[[e-mail] [e-mail] [e-mail]]
   s.summary          = 'Effortless multi-environment settings in Rails, Sinatra, Pandrino and others'
   s.description      = 'Easiest way to manage multi-environment settings in any ruby project or framework: ' +
                        'Rails, Sinatra, Pandrino and others'
   s.homepage         = 'https://github.com/railsconfig/config'
   s.license          = 'MIT'
-  s.extra_rdoc_files = %w(README.md CHANGELOG.md LICENSE.md)
+  s.extra_rdoc_files = %w[README.md CHANGELOG.md CONTRIBUTING.md LICENSE.md]
   s.rdoc_options     = ['--charset=UTF-8']
+  s.post_install_message = "\n\e[33mThanks for installing Config\e[0m 🙏
+Please consider donating to our open collective to help us maintain this project.
+\n
+👉  Donate: \e[34mhttps://opencollective.com/rubyconfig/donate\e[0m\n"
 
   s.files = `git ls-files`.split($/)
   s.files.select! { |file| /(^lib\/|\.md$|\.gemspec$)/ =~ file }
   s.files += Dir.glob('doc/**/*')
 
   s.require_paths         = ['lib']
   s.required_ruby_version = '>= 2.4.0'
 
-  s.add_dependency 'activesupport', '>= 4.2'
   s.add_dependency 'deep_merge', '~> 1.2', '>= 1.2.1'
-  s.add_dependency 'dry-schema', '~> 1.0'
+  s.add_dependency 'dry-validation', '~> 1.0'
 
-  s.add_development_dependency 'rake',        '~> 12.0',  '>= 12.0.0'
+  s.add_development_dependency 'rake', '~> 12.0', '>= 12.0.0'
 
   # Testing
-  s.add_development_dependency 'appraisal',   '~> 2.2',   '>= 2.2.0'
-  s.add_development_dependency 'rails',       '~> 5.2',   '>= 5.2.2'
-  s.add_development_dependency 'rspec',       '~> 3.7',   '>= 3.7.0'
-  s.add_development_dependency 'rspec-rails', '~> 3.7',   '>= 3.7.2'
-  s.add_development_dependency 'test-unit',   '~> 3.2',   '>= 3.2.7'
-  s.add_development_dependency 'sqlite3',     '~> 1.3',   '>= 1.3.13'
+  s.add_development_dependency 'appraisal', '~> 2.2', '>= 2.2.0'
+  s.add_development_dependency 'rspec', '~> 3.7', '>= 3.7.0'
 
+  # Default RSpec run will test against latest Rails app
+  unless ENV['APPRAISAL_INITIALIZED']
+    File.read(Dir['gemfiles/rails*.gemfile'].sort.last).scan(/gem "(.*?)", "(.*?)"/m) do |name, version|
+      s.add_development_dependency name, version
+    end
+  end
+
   # Static code analysis
-  s.add_development_dependency 'mdl',         '~> 0.5',   '>= 0.5.0'
+  s.add_development_dependency 'mdl', '~> 0.5', '>= 0.5.0'
 
   # Version 0.62 requires Ruby 2.2
-  s.add_development_dependency 'rubocop',     '~> 0.62'
+  s.add_development_dependency 'rubocop', '~> 0.62'
 
-  if ENV['TRAVIS']
+  if ENV['TRAVIS'] && ENV['TRAVIS_RUBY_VERSION'] != 'truffleruby'
     s.add_development_dependency 'codeclimate-test-reporter', '~> 1.0.9'
     s.add_development_dependency 'simplecov', '~> 0.13.0'
   end
 end