Adding error bar functionality?

[jreahl]

Hello!

I just downloaded this package and I'm really loving it, but I'm realizing that the current version (as far as I know) has nothing to generate error bars for the left, top, and right axes. It would be really awesome to have that kind of functionality in there!
I am not exactly sure how to brainstorm ideas for implementing that kind of change, but I do know that Nicholas Hamilton's ggtern package for R (located here: https://bitbucket.org/nicholasehamilton/ggtern/src/master/) has commands to generate error bars, and ggtern is an extension of ggplot like python-ternary is an extension of matplotlib, so maybe reading ggtern's error bar documentation would be a good place to start?