docs: def update_changelog():
      """
      Create or update the changelog txt file. Prompt for update description.
      :return None:
      """
      # description = input("Please enter a short description for this update:\n ")
      description = 'Placeholder for description here.'
  
      # open changelog file for appending. if doesn't exist, creates file.
      with open('changelog.txt', 'a+') as f:
          # write update line
          f.write(str(datetime.datetime.now().strftime("%d %B %Y %I:%M%p")) + '\nDescription: ' + description)
      return