```ruby
# -*- encoding: utf-8 -*-
require File.expand_path('../lib/periodicity/version', __FILE__)

Gem::Specification.new do |gem|
  gem.name        = 'periodicity'
  gem.version     = Periodicity::VERSION
  gem.description = gem.summary = "Job scheduler for Rails"
  gem.authors     = ["Dzmitry Plashchynski"]
  gem.email       = "plashchynski@gmail.com"
  gem.files       = `git ls-files`.split("\n")
  gem.require_paths = ["lib"]
  gem.homepage    = "https://github.com/plashchynski/periodicity"
  gem.license     = "Apache-2.0"
end
```

Update gemspec according to Bundler scaffold
user
```ruby
# -*- encoding: utf-8 -*-
require File.expand_path('../lib/periodicity/version', __FILE__)

Gem::Specification.new do |s|
  s.name        = "periodicity"
  s.version     = Periodicity::VERSION
  s.authors     = ["Dzmitry Plashchynski"]
  s.email       = ["plashchynski@gmail.com"]
  s.homepage    = "https://github.com/plashchynski/periodicity"
  gem.description = gem.summary = "Job scheduler for Rails"

  s.required_rubygems_version = ">= 1.3.6"
  s.rubyforge_project         = "periodicity"

  s.add_runtime_dependency      "activejob"
  s.add_development_dependency  "bundler", ">= 1.0.0"
  s.add_development_dependency  "rspec"

  s.files        = `git ls-files`.split("\n")
  s.executables  = `git ls-files`.split("\n").map{|f| f =~ /^bin\/(.*)/ ? $1 : nil}.compact
  s.require_path = 'lib'
end
```
assistant