monkeyengine.gemspec in MonkeyEngine-2.0.3 vs monkeyengine.gemspec in MonkeyEngine-2.0.4

@@ -16,23 +16,24 @@
     "write a book? The sky is the limit! Add your own AI! Publish the results! " \
     "Go...BANANAS!"
   spec.summary       = 'The engine that drives my monkeys!'
   spec.homepage      = 'https://github.com/gangelo/monkeyengine'
   spec.license       = 'MIT'
-  spec.required_ruby_version = '>= 3.0.1'
+  spec.required_ruby_version = Gem::Requirement.new('~> 3.0')
 
   spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '>= 2.4', '< 3.0'
-  spec.add_development_dependency 'colorize', '>= 0.8.1', '< 1.0'
-  spec.add_development_dependency 'pry-byebug', '>= 3.9', '< 4.0'
-  spec.add_development_dependency 'rake', '>= 13.0', '< 14.0'
-  spec.add_development_dependency 'redcarpet', '>= 2.3', '< 3.0'
-  spec.add_development_dependency 'rspec', '>= 3.10', '< 4.0'
-  spec.add_development_dependency 'yard', '>= 0.9.28', '< 1.0'
-
   spec.add_runtime_dependency 'LittleWeasel', '>= 5.0', '< 6.0'
-  spec.add_runtime_dependency 'ProtectedConstructor', '>= 2.0', '< 3.0'
+  spec.add_runtime_dependency 'ProtectedConstructor', '~> 3.0'
+  spec.post_install_message = <<~POST_INSTALL
+    Thank you for installing MonkeyEngine.
+
+    *** If you found this gem enjoyable, helpful or otherwise positive, please consider giving it a star on GitHub so I know this gem is worth maintaining ***
+
+    This is a gem created for fun and demonstrates a little about ruby threads.
+
+    Run `bundle exec rake engine:run` from your command line to see a sample.
+  POST_INSTALL
 end