Add a value to a field that supports multiple values, without resetting the existing values.

        This should work with: labels, multiple checkbox lists, multiple select

        :param field: The field name
        :param value: The field's value

        :type field: str

def add_field_value(self, field, value):
        """Add a value to a field that supports multiple values, without resetting the existing values.

        This should work with: labels, multiple checkbox lists, multiple select

        :param field: The field name
        :param value: The field's value

        :type field: str
        """
        super(Issue, self).update(fields={"update": {field: [{"add": value}]}})