Merge pull request jlevy#554 from dspinellis/progress-monitor

Add pmonitor link and correct tools' description

README.md

@@ -268,7 +268,7 @@ EOF
 mkdir empty && rsync -r --delete empty/ some-dir && rmdir some-dir
 ```
 
-- For seeing progress when copying files, use `pv`, [`pycp`](https://github.com/dmerejkowsky/pycp), [`progress`](https://github.com/Xfennec/progress), `rsync --progress`, or, for block-level copying, `dd status=progress`.
+- For monitoring progress when processing files, use [`pv`](http://www.ivarch.com/programs/pv.shtml), [`pycp`](https://github.com/dmerejkowsky/pycp), [`pmonitor`](https://github.com/dspinellis/pmonitor), [`progress`](https://github.com/Xfennec/progress), `rsync --progress`, or, for block-level copying, `dd status=progress`.
 
 - Use `shuf` to shuffle or select random lines from a file.