Write config to file

def write_config(self):
        """ Write config to file """
        if not os.path.exists(os.path.dirname(self.config_file)):
            os.makedirs(os.path.dirname(self.config_file))
        with open(self.config_file, 'w') as f:
            f.write(json.dumps(self.config))
            f.close()