Wrong example in BaseSerializer documentation

[tiran]

https://betamax.readthedocs.io/en/latest/serializers.html#betamax.BaseSerializer

class MySerializer(BaseSerializer):
    ...
    def deserialize(self):
        # Uses a cassette file to return a dictionary with the
        # cassette information

It should be def deserialize(self, cassette_data):.

[sigmavirus24]

I'd happily merge a PR that corrects this.