Incorrect comment in example - vixutil -r

[dougransom]

"What is the command line equivalent of -r so I can use/run src\examples\sample_plots.py?

Goal is to display the cash term structure with 1st, 2nd, etc month futures values (VX1, VX2, ...) using data pulled by vix_util.

3-24 Add: I was able to successfully run examples\sample_plots.py. That said its comments state you need to first run vixutil -r to download data which wasn't true with this version. That's a sample/comment bug. Updating docs to reflect there is now no -r command line option would be a plus :)"

From a comment in #15

[dougransom]

fixed in 5d98de9