def download(output_filename, options = {target_backup: nil})
      raise "Please specify a filename" if output_filename.length.eql?(0)
      HerokuCLI.cmd("pg:backups:download #{target_backup} --output #{output_filename}", @app_name)
    end
def download(output_filename, options = {target_backup: nil})
      raise "Please specify a filename" if output_filename.length.eql?(0)
      HerokuCLI.cmd("pg:backups:download #{target_backup} --output #{output_filename}", @app_name)
    end
Download the latest backup
 @param {string} output_filename
 @param {hash} options
 Valid options:
 => {string?} target_backup - If a target is set, a backup will be pulled from there,
    otherwise, we'll pull from the latest backup
 @param {hash} options