old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  credentials = {
      'verify-email.org': {
          'username': 'YOURUSERNAME',
          'password': 'YOURPASSWORD',
      }
      'emailhippo.com': {
          'api_url': 'https://domain.com/api/v2',
          'api_key': 'YOURAPIKEY',
      }
  }
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  credentials = {
      'verify-email.org': {
          'username': 'YOURUSERNAME',
          'password': 'YOURPASSWORD',
      }
      'emailhippo.com': {
          'api_url': 'https://domain.com/api/v2',
          'api_key': 'YOURAPIKEY',
      },
      'email-validator.net': {
          'api_key': '',
      },
  }
  
subject: Add an other provider to config