```ruby
# -*- encoding: utf-8 -*-

require File.expand_path('../lib/adamantium/version', __FILE__)

Gem::Specification.new do |gem|
  gem.name        = 'adamantium'
  gem.version     = Adamantium::VERSION.dup
  gem.authors     = [ 'Dan Kubb', 'Markus Schirp' ]
  gem.email       = [ 'dan.kubb@gmail.com', 'mbj@seonic.net' ]
  gem.description = 'Immutable extensions to objects'
  gem.summary     = gem.description
  gem.homepage    = 'https://github.com/dkubb/adamantium'

  gem.require_paths    = [ 'lib' ]
  gem.files            = `git ls-files`.split("\n")
  gem.test_files       = `git ls-files -- {spec}/*`.split("\n")
  gem.extra_rdoc_files = %w[LICENSE README.md TODO]

  gem.add_runtime_dependency('backports', '~> 2.6.1')
  gem.add_runtime_dependency('ice_nine',  '~> 0.4.0')

  gem.add_development_dependency('rake',  '~> 0.9.2')
  gem.add_development_dependency('rspec', '~> 1.3.2')
  gem.add_development_dependency('yard',  '~> 0.8.1')
end
```

Fix code formatting in gemspec
user
```ruby
# -*- encoding: utf-8 -*-

require File.expand_path('../lib/adamantium/version', __FILE__)

Gem::Specification.new do |gem|
  gem.name        = 'adamantium'
  gem.version     = Adamantium::VERSION.dup
  gem.authors     = ['Dan Kubb', 'Markus Schirp']
  gem.email       = %w[dan.kubb@gmail.com mbj@seonic.net]
  gem.description = 'Immutable extensions to objects'
  gem.summary     = gem.description
  gem.homepage    = 'https://github.com/dkubb/adamantium'

  gem.require_paths    = %w[lib]
  gem.files            = `git ls-files`.split($/)
  gem.test_files       = `git ls-files -- {spec}/*`.split($/)
  gem.extra_rdoc_files = %w[LICENSE README.md TODO]

  gem.add_runtime_dependency('backports', '~> 2.6.1')
  gem.add_runtime_dependency('ice_nine',  '~> 0.4.0')

  gem.add_development_dependency('rake',  '~> 0.9.2')
  gem.add_development_dependency('rspec', '~> 1.3.2')
  gem.add_development_dependency('yard',  '~> 0.8.1')
end
```
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