Fraud Anomaly Detection data update

I was working my way through the AnomalyDetection_CreditCardFraudDetection project, and discovered that the dataset from Kaggle had to be modified to run properly with the tutorial code.
After some digging, I saw the dataset that's in the repo already had these changes in it, but since I followed the tutorial readme I just downloaded the data from Kaggle. I'd recommend adding a note or something to help others in the future.

- Csv header name for 'Class' change to 'Label' to match TransactionObservation.cs
- Modify all entries in that same column from strings ("0", "1") to numbers (0, 1) so the IDataView LoadFromTextFile import works.