Increments counter by given value.

        :param name: a counter name of Increment type.

        :param value: a value to add to the counter.

def increment(self, name, value):
        """
        Increments counter by given value.

        :param name: a counter name of Increment type.

        :param value: a value to add to the counter.
        """
        counter = self.get(name, CounterType.Increment)
        counter.count = counter.count + value if counter.count != None else value
        self._update()