```ruby
# coding: utf-8

lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'rubo/version'

Gem::Specification.new do |spec|
  spec.name          = 'rubo'
  spec.version       = Rubo::VERSION
  spec.authors       = ['Kazuya Takeshima']
  spec.email         = ['mail@mitukiii.jp']
  spec.summary       = %q{Rubo is a chat bot}
  spec.homepage      = 'https://github.com/mitukiii/rubo'
  spec.license       = 'MIT'

  spec.files         = `git ls-files`.split($/)
  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_runtime_dependency 'hashie', '~> 2.0.5'
  spec.add_runtime_dependency 'colorize', '~> 0.6.0'

  spec.add_development_dependency 'bundler', '~> 1.5'
  spec.add_development_dependency 'rake'
  spec.add_development_dependency 'rspec'
  spec.add_development_dependency 'simplecov'
  spec.add_development_dependency 'yard'
end
```

Add twitter gem to dependency
user
```ruby
# coding: utf-8

lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'rubo/version'

Gem::Specification.new do |spec|
  spec.name          = 'rubo'
  spec.version       = Rubo::VERSION
  spec.authors       = ['Kazuya Takeshima']
  spec.email         = ['mail@mitukiii.jp']
  spec.summary       = %q{Rubo is a chat bot}
  spec.homepage      = 'https://github.com/mitukiii/rubo'
  spec.license       = 'MIT'

  spec.files         = `git ls-files`.split($/)
  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_runtime_dependency 'twitter', '~> 5.7.1'
  spec.add_runtime_dependency 'hashie', '~> 2.0.5'
  spec.add_runtime_dependency 'colorize', '~> 0.6.0'

  spec.add_development_dependency 'bundler', '~> 1.5'
  spec.add_development_dependency 'rake'
  spec.add_development_dependency 'rspec'
  spec.add_development_dependency 'simplecov'
  spec.add_development_dependency 'yard'
end
```
assistant