```ruby
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'private_address_check/version'

Gem::Specification.new do |spec|
  spec.name          = "private_address_check"
  spec.version       = PrivateAddressCheck::VERSION
  spec.authors       = ["John Downey"]
  spec.email         = ["jdowney@gmail.com"]

  spec.summary       = %q{Checks if a URL or hostname would cause a request to a private network (RFC 1918)}
  spec.description   = %q{Checks if a URL or hostname would cause a request to a private network (RFC 1918)}
  spec.homepage      = "https://github.com/jtdowney/private_address_check"
  spec.license       = "MIT"

  spec.files         = Dir.glob("{lib,test}/**/*.rb") + %w[CODE_OF_CONDUCT.md Gemfile LICENSE.txt README.md Rakefile]
  spec.require_paths = ["lib"]

  spec.required_ruby_version ">= 2.0.0"

  spec.add_development_dependency "bundler", "~> 1.12"
  spec.add_development_dependency "rake", "~> 10.0"
  spec.add_development_dependency "minitest", "~> 5.0"
end
```

Fix error in gemspec with specifying Ruby version
user
```ruby
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'private_address_check/version'

Gem::Specification.new do |spec|
  spec.name          = "private_address_check"
  spec.version       = PrivateAddressCheck::VERSION
  spec.authors       = ["John Downey"]
  spec.email         = ["jdowney@gmail.com"]

  spec.summary       = %q{Checks if a URL or hostname would cause a request to a private network (RFC 1918)}
  spec.description   = %q{Checks if a URL or hostname would cause a request to a private network (RFC 1918)}
  spec.homepage      = "https://github.com/jtdowney/private_address_check"
  spec.license       = "MIT"

  spec.files         = Dir.glob("{lib,test}/**/*.rb") + %w[CODE_OF_CONDUCT.md Gemfile LICENSE.txt README.md Rakefile]
  spec.require_paths = ["lib"]

  spec.required_ruby_version = ">= 2.0.0"

  spec.add_development_dependency "bundler", "~> 1.12"
  spec.add_development_dependency "rake", "~> 10.0"
  spec.add_development_dependency "minitest", "~> 5.0"
end
```
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