Used to mark the current user's experiment variant as "converted" e.g.,

        "Suzy, who was shown the large button, just signed up."

        Conversions will *only* be marked for visitors who have been verified
        as humans (to avoid skewing reports with requests from bots and web
        crawlers).

        :param experiment_name the string name of the experiment

def score(self, experiment_name):
        """
        Used to mark the current user's experiment variant as "converted" e.g.,

        "Suzy, who was shown the large button, just signed up."

        Conversions will *only* be marked for visitors who have been verified
        as humans (to avoid skewing reports with requests from bots and web
        crawlers).

        :param experiment_name the string name of the experiment
        """
        if self._backend.get_variant(self.identity, experiment_name) and \
                self.human is True:
            self._backend.mark_conversion(
                experiment_name,
                self._backend.get_variant(self.identity, experiment_name)
            )