Ctrl-C Interrupt Breaks `terragrunt` executable

```
➜  .terraform.versions tgswitch
Use the arrow keys to navigate: ↓ ↑ → ←
? Select terragrunt version:
  ▸ 0.23.11
    0.21.7
    0.13.20
    0.23.16
↓   0.23.15
2020/05/11 13:23:30 Prompt failed ^C
➜  .terraform.versions terragrunt -v
zsh: command not found: terragrunt
```