Error

### Steps to reproduce

1) Run `# nearby -i wlan0`

2) Results in
```
Error: Error(IoError(Os { code: 2, kind: NotFound, message: "No such file or directory" }), State { next_error: None, backtrace: InternalBacktrace })
```

### Versions
nearby 37 commit master branch
linux 5.7.2
iwlwifi driver (supports monitor mode)