```ruby
Gem::Specification.new do |s|
  s.name     = 'activefile'
  s.version  = '0.1'
  s.authors  = 'David Heinemeier Hansson'
  s.email    = 'david@basecamp.com'
  s.summary  = 'Store files in Rails applications'
  s.homepage = 'https://github.com/rails/activefile'
  s.license  = 'MIT'

  s.required_ruby_version = '>= 1.9.3'

  s.add_dependency 'activesupport', '>= 5.1'
  s.add_dependency 'activerecord', '>= 5.1'
  s.add_dependency 'activejob', '>= 5.1'

  s.add_development_dependency 'bundler', '~> 1.15'

  s.files         = `git ls-files`.split("\n")
  s.test_files    = `git ls-files -- test/*`.split("\n")
end
```

Switch to double quotes for Rails linter
user
```ruby
Gem::Specification.new do |s|
  s.name     = "activefile"
  s.version  = "0.1"
  s.authors  = "David Heinemeier Hansson"
  s.email    = "david@basecamp.com"
  s.summary  = "Store files in Rails applications"
  s.homepage = "https://github.com/rails/activefile"
  s.license  = "MIT"

  s.required_ruby_version = ">= 1.9.3"

  s.add_dependency "activesupport", ">= 5.1"
  s.add_dependency "activerecord", ">= 5.1"
  s.add_dependency "activejob", ">= 5.1"

  s.add_development_dependency "bundler", "~> 1.15"

  s.files         = `git ls-files`.split("\n")
  s.test_files    = `git ls-files -- test/*`.split("\n")
end
```
assistant