text: Title: Possible future data leak on CUBE and IFISHER
  Body: After quick inspection, if I'm not wrong, there seem to be a future data leak with CUBE and IFISHER when using `study.AllStudy`, as they both have an offset set by default to -1. Please update the readme to point this out. AI model time series feature importance impact evaluation: 
  ![image](https://user-images.githubusercontent.com/45826736/192151599-4ecb54f8-042d-4aea-8c12-c2f1b045df75.png)
  