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

Gem::Specification.new do |spec|
  spec.name          = "enumerable-statistics"
  spec.version       = '1.1.0'
  spec.authors       = ["Kenta Murata"]
  spec.email         = ["mrkn@mrkn.jp"]

  spec.summary       = %q{Statistics features for Enumerable}
  spec.description   = %q{This library provides statistics features for Enumerable}
  spec.homepage      = "https://github.com/mrkn/enumerable-statistics"

  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
  spec.bindir        = "exe"
  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
  spec.require_paths = ["ext", "lib"]
  spec.extensions    = Dir['ext/**/extconf.rb']

  spec.add_development_dependency "bundler", ">= 1.17.2"
  spec.add_development_dependency "rake", "~> 10.0"
  spec.add_development_dependency "rake-compiler", "~> 0.9.8"
  spec.add_development_dependency "rspec", "~> 3.4"
  spec.add_development_dependency "fuubar"
  spec.add_development_dependency "benchmark-driver"
end
```

Add .dev suffix in version number
user
```ruby
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)

Gem::Specification.new do |spec|
  spec.name          = "enumerable-statistics"
  spec.version       = '1.1.0.dev'
  spec.authors       = ["Kenta Murata"]
  spec.email         = ["mrkn@mrkn.jp"]

  spec.summary       = %q{Statistics features for Enumerable}
  spec.description   = %q{This library provides statistics features for Enumerable}
  spec.homepage      = "https://github.com/mrkn/enumerable-statistics"

  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
  spec.bindir        = "exe"
  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
  spec.require_paths = ["ext", "lib"]
  spec.extensions    = Dir['ext/**/extconf.rb']

  spec.add_development_dependency "bundler", ">= 1.17.2"
  spec.add_development_dependency "rake", "~> 10.0"
  spec.add_development_dependency "rake-compiler", "~> 0.9.8"
  spec.add_development_dependency "rspec", "~> 3.4"
  spec.add_development_dependency "fuubar"
  spec.add_development_dependency "benchmark-driver"
end
```
assistant