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

Gem::Specification.new do |spec|
  spec.name          = "tty-tree"
  spec.version       = TTY::Tree::VERSION
  spec.authors       = ["Piotr Murach"]
  spec.email         = [""]

  spec.summary       = %q{Print directory or structured data in a tree like format.}
  spec.description   = %q{Print directory or structured data in a tree like format.}
  spec.homepage      = "https://piotrmurach.github.io/tty"
  spec.license       = "MIT"

  spec.files         = Dir['{lib,spec}/**/*.rb', '{bin,tasks}/*', 'tty-tree.gemspec']
  spec.files        += Dir['README.md', 'CHANGELOG.md', 'LICENSE.txt', 'Rakefile']
  spec.bindir        = "exe"
  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
  spec.require_paths = ["lib"]

  spec.required_ruby_version = '>= 2.0.0'

  spec.add_development_dependency "bundler", "~> 2.0"
  spec.add_development_dependency "rake", "~> 10.0"
  spec.add_development_dependency "rspec", "~> 3.0"
end
```

Change to relax dev deps
user
```ruby
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'tty/tree/version'

Gem::Specification.new do |spec|
  spec.name          = "tty-tree"
  spec.version       = TTY::Tree::VERSION
  spec.authors       = ["Piotr Murach"]
  spec.email         = ["me@piotrmurach.com"]

  spec.summary       = %q{Print directory or structured data in a tree like format.}
  spec.description   = %q{Print directory or structured data in a tree like format.}
  spec.homepage      = "https://piotrmurach.github.io/tty"
  spec.license       = "MIT"

  spec.files         = Dir['{lib,spec}/**/*.rb', '{bin,tasks}/*', 'tty-tree.gemspec']
  spec.files        += Dir['README.md', 'CHANGELOG.md', 'LICENSE.txt', 'Rakefile']
  spec.bindir        = "exe"
  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
  spec.require_paths = ["lib"]

  spec.required_ruby_version = '>= 2.0.0'

  spec.add_development_dependency "bundler", ">= 1.14.0"
  spec.add_development_dependency "rake"
  spec.add_development_dependency "rspec", "~> 3.0"
end
```
assistant