old_contents: API_HOST_SCHEME='http'
  API_VERSION='1.3'
  API_HOST='api.mailchimp.com/%s/?method=' % (API_VERSION)
  API_KEY = '76dadc0bee38544886989dee1892e3bb-us4'
  
new_contents: API_HOST_SCHEME='http'
  API_VERSION='1.3'
  API_HOST='api.mailchimp.com/%s/?method=' % (API_VERSION)
  API_KEY = 'Your-API-Key'
  
subject: Remove API Key