```ruby
# -*- encoding: utf-8 -*-

Gem::Specification.new do |spec|
  spec.name          = "motion-screenshots"
  spec.version       = "0.1.0"
  spec.authors       = ["Clay Allsopp"]
  spec.email         = ["clay@usepropeller.com"]
  spec.description   = "Take screenshots with RubyMotion"
  spec.summary       = "Take screenshots with RubyMotion"
  spec.homepage      = "https://github.com/usepropeller/motion-screenshots"
  spec.license       = "MIT"

  files = []
  files << 'README.md'
  files.concat(Dir.glob('lib/**/*.rb'))
  files << 'motion-screenshots.gemspec'
  spec.files         = files
  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
  spec.require_paths = ["lib"]

  spec.add_dependency "motion-cocoapods", ">= 1.4.0"
  spec.add_dependency "motion-env", ">= 0.0.3"

  spec.add_development_dependency "rake"
end
```

Add dependency to plist gem and bump others to working versions.
user
```ruby
# -*- encoding: utf-8 -*-

Gem::Specification.new do |spec|
  spec.name          = "motion-screenshots"
  spec.version       = "0.1.0"
  spec.authors       = ["Clay Allsopp"]
  spec.email         = ["clay@usepropeller.com"]
  spec.description   = "Take screenshots with RubyMotion"
  spec.summary       = "Take screenshots with RubyMotion"
  spec.homepage      = "https://github.com/usepropeller/motion-screenshots"
  spec.license       = "MIT"

  files = []
  files << 'README.md'
  files.concat(Dir.glob('lib/**/*.rb'))
  files << 'motion-screenshots.gemspec'
  spec.files         = files
  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
  spec.require_paths = ["lib"]

  spec.add_dependency "motion-cocoapods", ">= 1.7.0"
  spec.add_dependency "motion-env", ">= 0.0.4"
  spec.add_dependency "plist", ">= 3.1.0"
  
  spec.add_development_dependency "rake"
end
```
assistant