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

Gem::Specification.new do |gem|
  gem.authors       = ["Sam Saffron"]
  gem.email         = ["sam.saffron@gmail.com"]
  gem.description   = %q{A message bus for rack}
  gem.summary       = %q{}
  gem.homepage      = ""

  gem.files         = `git ls-files`.split($\)
  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
  gem.name          = "message_bus"
  gem.require_paths = ["lib"]
  gem.version       = MessageBus::VERSION
  gem.add_runtime_dependency 'rack', '>= 1.1.3'
  gem.add_runtime_dependency 'eventmachine'
  gem.add_runtime_dependency 'redis'
end
```

Add license and homepage to gemspec.
user
```ruby
# -*- encoding: utf-8 -*-
require File.expand_path('../lib/message_bus/version', __FILE__)

Gem::Specification.new do |gem|
  gem.authors       = ["Sam Saffron"]
  gem.email         = ["sam.saffron@gmail.com"]
  gem.description   = %q{A message bus for rack}
  gem.summary       = %q{}
  gem.homepage      = "https://github.com/SamSaffron/message_bus"
  gem.license       = "MIT"

  gem.files         = `git ls-files`.split($\)
  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
  gem.name          = "message_bus"
  gem.require_paths = ["lib"]
  gem.version       = MessageBus::VERSION
  gem.add_runtime_dependency 'rack', '>= 1.1.3'
  gem.add_runtime_dependency 'eventmachine'
  gem.add_runtime_dependency 'redis'
end
```
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