```ruby
# encoding: utf-8

$LOAD_PATH.unshift(File.expand_path('../lib/', __FILE__))
require 'adsf'

Gem::Specification.new do |s|
  s.name                  = 'adsf'
  s.version               = Adsf::VERSION
  s.platform              = Gem::Platform::RUBY
  s.summary               = 'a tiny static file server'
  s.description           = 'A web server that can be spawned in any directory'
  s.homepage              = 'http://github.com/ddfreyne/adsf/'
  s.license               = 'MIT'

  s.author                = 'Denis Defreyne'
  s.email                 = 'denis.defreyne@stoneship.org'

  s.required_ruby_version = '>= 1.8.5'
  s.add_runtime_dependency('rack', '>= 1.0.0')

  s.has_rdoc              = false

  s.files                 = Dir['[A-Z]*'] + Dir['bin/**/*'] + Dir['lib/**/*']
  s.executables           = [ 'adsf' ]
  s.require_path          = 'lib'
  s.bindir                = 'bin'
end
```

Set minimum required Ruby version to 2.1.0
user
```ruby
# encoding: utf-8

$LOAD_PATH.unshift(File.expand_path('../lib/', __FILE__))
require 'adsf'

Gem::Specification.new do |s|
  s.name                  = 'adsf'
  s.version               = Adsf::VERSION
  s.platform              = Gem::Platform::RUBY
  s.summary               = 'a tiny static file server'
  s.description           = 'A web server that can be spawned in any directory'
  s.homepage              = 'http://github.com/ddfreyne/adsf/'
  s.license               = 'MIT'

  s.author                = 'Denis Defreyne'
  s.email                 = 'denis.defreyne@stoneship.org'

  s.required_ruby_version = '>= 2.1.0'
  s.add_runtime_dependency('rack', '>= 1.0.0')

  s.has_rdoc              = false

  s.files                 = Dir['[A-Z]*'] + Dir['bin/**/*'] + Dir['lib/**/*']
  s.executables           = [ 'adsf' ]
  s.require_path          = 'lib'
  s.bindir                = 'bin'
end
```
assistant