use save_files as other parameters also use '_' and not '-'.
Keep compatibility with save-files, this can be removed later on.
Added usage example on README.md
@bgoncalv thank you!
Commit a351b676 fixes this pull-request
Pull-Request has been merged by astepano
use save_files as other parameters also use '_' and not '-'.
Keep compatibility with save-files, this can be removed later on.
Added usage example on README.md