Does not work if filename has non-English characters

The following code fails if the file has `æ`, `å` or `ø` in it. I can imagine it would fail with other non-English characters as well. Would it be possible to fix this?

```python
import magic as m

print(m.from_file(r'C:\Users\------\Desktop\data\æøå.pdf'))
```

Error:
```
cannot open `C:\Users\------\Desktop\data\æøå.pdf' (No such file or directory)
```