def send_file(file, caption = nil, filename: nil, spoiler: nil)
      pm.send_file(file, caption: caption, filename: filename, spoiler: spoiler)
    end
def send_file(file, caption = nil, filename: nil, spoiler: nil)
      pm.send_file(file, caption: caption, filename: filename, spoiler: spoiler)
    end
Send the user a file.
 @param file [File] The file to send to the user
 @param caption [String] The caption of the file being sent
 @param filename [String] Overrides the filename of the uploaded file
 @param spoiler [true, false] Whether or not this file should appear as a spoiler.
 @return [Message] the message sent to this user.
 @example Send a file from disk
   user.send_file(File.open('rubytaco.png', 'r'))