Use `SortableSudokuGrid` instead of `SudokuGrid`.
Use `SortableSudokuGrid` instead of `SudokuGrid`.

In your usage instructions you use `SudokuGrid` and then in your example you use `SortableSudokuGrid`. This just makes them consistent. 

Also did some minor formatting updates.
react-native-component/react-native-smart-sortable-sudoku-grid