v7.0.0

Changes

🚨 Breaking Changes

• Signature change: new GenericContainer('image', 'tag') => new GenericContainer('image:tag')
  The reason for this is to support providing an optional registry, eg. new GenericContainer('registry/image:tag')
• withAuthentication method has been removed.
  Authentication is now automatically resolved from $HOME/.docker/config.json

🚀 Features

• Load registry auth information @cristianrgreco (#179)