Quiet mode

Hello!

Thanks for a nice package. 

I was wondering if there is a way to get rid of the `print_short_menu()` call when running? It would be nice to only see the pytest output.
e.g. `$ ptw --now --clear . -- -q -s`

```
<my logs>
.
1 passed in 0.02s
[pytest-watcher]
Current runner args: [-q -s]
Press w to show menu
```