Add the information for a individual

            This adds a genotype dict to variant['individuals']

            Args:
                genotype (dict): A genotype dictionary

def add_individual(self, genotype):
        """Add the information for a individual

            This adds a genotype dict to variant['individuals']

            Args:
                genotype (dict): A genotype dictionary
        """
        logger.debug("Adding genotype {0} to variant {1}".format(
            genotype, self['variant_id']))
        self['individuals'].append(genotype)