touch: Better error message when no args is given
touch: Better error message when no args is given

Matches the behavior of GNU touch

```shell
hbina@akarin ~/g/uutils (hbina-realpath-absolute-symlinks)> touch > /dev/null
touch: missing file operand
Try 'touch --help' for more information.
hbina@akarin ~/g/uutils (hbina-realpath-absolute-symlinks) [1]> cargo run --quiet -- touch > /dev/null
touch: missing file operand
Try 'touch --help' for more information.
hbina@akarin ~/g/uutils (hbina-realpath-absolute-symlinks) [1]> cargo run --quiet -- touch 2> /dev/null
hbina@akarin ~/g/uutils (hbina-realpath-absolute-symlinks) [1]> touch 2> /dev/null
```

Signed-off-by: Hanif Ariffin <85d3f5f3fffabf378f77eeaca666e0cc8140d099@gmail.com>

uutils/coreutils,uutils/coreutils,uutils/coreutils