old_contents: """Application configuration file."""
  # Flask
  DEBUG = False
  SECRET_KEY = ''
  
  # Flask SQLAlchemy
  SQLALCHEMY_DATABASE_URI = "sqlite:///foo.db"
  SQLALCHEMY_ECHO = False
  SQLALCHEMY_TRACK_MODIFICATIONS = False
  
  # Flask-HTMLmin
  MINIFY_PAGE = True
  
  # Flask Bcrypt
  BCRYPT_LOG_ROUNDS = 14
  
  # Flask-WTF
  WTF_CSRF_SECRET_KEY = ''
  
new_contents: """Application configuration file."""
  # Flask
  DEBUG = False
  SECRET_KEY = 'CHANGEME'
  
  # Flask SQLAlchemy
  SQLALCHEMY_DATABASE_URI = "sqlite:///foo.db"
  SQLALCHEMY_ECHO = False
  SQLALCHEMY_TRACK_MODIFICATIONS = False
  
  # Flask-HTMLmin
  MINIFY_PAGE = True
  
  # Flask Bcrypt
  BCRYPT_LOG_ROUNDS = 14
  
  # Flask-WTF
  WTF_CSRF_SECRET_KEY = 'CHANGEME'
  
subject: Add default SECRET_KEY to config