Added statement_descriptor to Data.mock_charge

Author: TrevorHinesley

lib/stripe_mock/data.rb

@@ -65,6 +65,7 @@ def self.mock_charge(params={})
  receipt_number: nil,
  refunded: false,
  shipping: {},
+ statement_descriptor: "Charge #{charge_id}",
  status: 'succeeded',
  source: {
  object: "card",