sudoku-tui 0.2.0

Play sudoku on the command line. (TUI interface)
Documentation
## 0.2.0 2020-10-10

### New Features

- Info panel
- Timing

### Bugfix

- corrected undo & redo behaviour
- undo & redo should be counted as moves

## 0.1.0 2020-10-09

### New Features

- use `crossterm` to provide windows support

## 0.0.4 2020-10-09

### New Features

- Config view and Finish views (not quite elaborated at the moment, though)

### Bugfix

- Now entering `0` into an empty cell will be ignored.

## 0.0.3 2020-10-08

### New Features

- Undo/Redo

### Bugfix

- Fix the issue that adding a hint may lead to invalid board