Method to return back a loaded instance.

def from_config(cls):
        """Method to return back a loaded instance."""
        config = Config()
        client = cls(
            email=config.get('email'),
            api_key=config.get('api_key'),
            server=config.get('api_server'),
            http_proxy=config.get('http_proxy'),
            https_proxy=config.get('https_proxy'),
        )
        return client