old_contents: const API_EVENTS_URL = '/api/v1/splash-events/?start_time__gte=2017-08-01';
  const API_SLACK_URL = '/api/v1/slack/';
  
  export { API_EVENTS_URL, API_SLACK_URL };
  
new_contents: const API_EVENTS_URL = '/api/v1/splash-events/?start_time__gte=2018-08-01';
  const API_SLACK_URL = '/api/v1/slack/';
  
  export { API_EVENTS_URL, API_SLACK_URL };
  
subject: update start date