Applying in place changes file's permissions

Create `somefile` and get permissions (`644`)

```console
$ echo "x" > somefile
$ stat -c "%a %n" somefile
644 somefile
```

run `PythonSed` in place and get permissions:

```console
$ python3 -c "from PythonSed import Sed; sed = Sed(in_place=''); sed.load_string('s/x/y/'); sed.apply('somefile')"
$ stat -c "%a %n" somefile
600 somefile
```

Permissions are changed to `600`