def validate_version!
      Docker.info
      true
    rescue Docker::Error::DockerError
      raise Docker::Error::VersionError, "Expected API Version: #{API_VERSION}"
    end
def validate_version!
      Docker.info
      true
    rescue Docker::Error::DockerError
      raise Docker::Error::VersionError, "Expected API Version: #{API_VERSION}"
    end
When the correct version of Docker is installed, returns true. Otherwise,
 raises a VersionError.