class Github::PullRequests

def files(user_name, repo_name, request_id, params={})
  set :user => user_name, :repo => repo_name
  assert_presence_of user, repo, request_id
  normalize! params
  # _merge_mime_type(:pull_request, params)
  response = get_request("/repos/#{user}/#{repo}/pulls/#{request_id}/files", params)
  return response unless block_given?
  response.each { |el| yield el }
end