[Windows] Not a terminal error when shift key is pressed

When reading a line from the terminal, pressing the shift key results in an error `{ kind: NotConnected, error: "Not a terminal" }` on Windows. It seems to happen with both Powershell and Command Prompt

# To Reproduce

(In Windows)

```bash
git clone https://github.com/mitsuhiko/console.git
cargo run --example term
# press shift key on the To edit prompt
```