```ruby
Gem::Specification.new do |s|
  s.name        = "jekyll-sitemap"
  s.summary     = "Automatically generate a sitemap.xml for your Jekyll site."
  s.version     = "0.4.1"
  s.authors     = ["GitHub, Inc."]
  s.email       = "support@github.com"
  s.homepage    = "https://github.com/github/jekyll-sitemap"
  s.licenses    = ["MIT"]

  s.files         = Dir["lib/*"]
  s.require_paths = ["lib"]

  s.add_dependency "jekyll", "~> 2.0"
  s.add_development_dependency "rspec", "~> 3.0"
  s.add_development_dependency "rake"
end
```

Bring the spec into the 21st century
user
```ruby
  s.version     = "0.4.1"
# coding: utf-8

Gem::Specification.new do |spec|
  spec.name        = "jekyll-sitemap"
  spec.summary     = "Automatically generate a sitemap.xml for your Jekyll site."
  spec.authors     = ["GitHub, Inc."]
  spec.email       = "support@github.com"
  spec.homepage    = "https://github.com/jekyll/jekyll-sitemap"
  spec.licenses    = ["MIT"]

  spec.files         = `git ls-files -z`.split("\x0")
  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 "jekyll", "~> 2.0"
  spec.add_development_dependency "rspec", "~> 3.0"
  spec.add_development_dependency "rake"
  spec.add_development_dependency "bundler", "~> 1.6"
end
```
assistant