Set modification time before file mode on Windows

[gaborh-da]

If one sets the file mode first, then a read only file's modification
time cannot be set.

[lehins]

@gaborh-da you are totally right, we need to update that behavior on unix as well. I mistakenly thought updating attributes will update the mtime, but it only updates ctime. I'll merge the PR a bit later, change the behavior on Unix and do a release later on today.

[gaborh-da]

@lehins I am not sure it needs update on Unix. I tried the following scenario:

1. touched a file
2. chmod 400 on that file which should be read only
3. then, chmod 555 and it still worked