```ruby
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'journald/modules/version'

Gem::Specification.new do |spec|
  spec.name          = 'journald-logger'
  spec.version       = Journald::Logger::VERSION
  spec.authors       = ['Anton Smirnov']
  spec.email         = ['sandfox@sandfox.me']
  spec.summary       = %q{systemd-journal native logger}
  # spec.description   = %q{TODO: Write a longer description. Optional.}
  spec.homepage      = 'https://github.com/sandfoxme/journald-logger'
  spec.license       = 'MIT'

  spec.files         = `git ls-files -z`.split("\x0")
  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
  spec.require_paths = ['lib']

  spec.required_ruby_version = '>= 2.1.0'

  spec.add_runtime_dependency 'journald-native', '~> 1.0'

  spec.add_development_dependency 'bundler', '~> 1.6'
  spec.add_development_dependency 'rake'
  spec.add_development_dependency 'rspec',   '~> 3.4'
  spec.add_development_dependency 'simplecov'
end
```

Revert "drop ruby < 2.0 support"
user
```ruby
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'journald/modules/version'

Gem::Specification.new do |spec|
  spec.name          = 'journald-logger'
  spec.version       = Journald::Logger::VERSION
  spec.authors       = ['Anton Smirnov']
  spec.email         = ['sandfox@sandfox.me']
  spec.summary       = %q{systemd-journal native logger}
  # spec.description   = %q{TODO: Write a longer description. Optional.}
  spec.homepage      = 'https://github.com/sandfoxme/journald-logger'
  spec.license       = 'MIT'

  spec.files         = `git ls-files -z`.split("\x0")
  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
  spec.require_paths = ['lib']

  spec.required_ruby_version = '>= 2.0.0'

  spec.add_runtime_dependency 'journald-native', '~> 1.0'

  spec.add_development_dependency 'bundler', '~> 1.6'
  spec.add_development_dependency 'rake'
  spec.add_development_dependency 'rspec',   '~> 3.4'
  spec.add_development_dependency 'simplecov'
end
```
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