def add_tags(self):
        """Add tags to security group.

        Returns:
            True: Upon successful completion.
        """
        session = boto3.session.Session(profile_name=self.env, region_name=self.region)
        resource = session.resource('ec2')
        group_id = get_security_group_id(self.app_name, self.env, self.region)
        security_group = resource.SecurityGroup(group_id)

        try:
            tag = security_group.create_tags(
                DryRun=False,
                Tags=[{
                    'Key': 'app_group',
                    'Value': self.group
                }, {
                    'Key': 'app_name',
                    'Value': self.app_name
                }])
            self.log.debug('Security group has been tagged: %s', tag)
        except botocore.exceptions.ClientError as error:
            self.log.warning(error)

        return True
Add tags to security group.

        Returns:
            True: Upon successful completion.