Shift + Enter does not move editing to cell above

[luciancic]

Fantastic library, I love it. However, I found a small bug that's affecting my client. I thought rather than patch it in his code I'd fix it here and update the package version. What's your level of involvement in the codebase at this point? I don't mind fixing it and opening a pull request. It would help me out however if you could point me in the right direction and let me know your timeline for merging/publishing. Thanks!

Steps to reproduce

1. Open up the demo
2. Edit a cell in the middle of the table
3. Press shift + enter

Expected behavior

Cell focus moves up and you can edit the cell above

Actual behavior

You have a multi-cell selection (as if you dragged the cursor over the 2 cells) and if you type in something the lower cell gets edited.