[issue5758] fileinput.hook_compressed returning bytes from gz file

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

> I'm struggling with how to adapt the code to provide a uniform interface on Python 3.6+.

It's easy. Just passing `mode="rb"`.

```
FileInput(filelist, mode="rb", openhook=fileinput.hook_compressed)
```

This is better than `backports.hook_compressed`, because it returns bytes always regardless file is compressed or uncompressed.

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<https://bugs.python.org/issue5758>
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