rnn/demmio: Add -h option
rnn/demmio: Add -h option

For printing help, duh!

Signed-off-by: Lyude Paul <1d05c5face2dc786c0af2cf362656a51f0df9b63@redhat.com>

envytools/envytools,karolherbst/envytools,envytools/envytools,envytools/envytools,karolherbst/envytools,karolherbst/envytools,envytools/envytools,envytools/envytools,karolherbst/envytools,karolherbst/envytools