FYI, kitty https://github.com/kovidgoyal/kitty just landed support for ligatures. https://github.com/kovidgoyal/kitty/issues/50
I used FiraCode in my testing and have included a copy in the kitty test data, I hope that is OK. If not, let me know and I will remove it.
I wasn鈥檛 able to get ligatures working. Is there a setting I need to enable?

It's not released as yet, so you have to build from master. Here's a screenshot of what it looks like (on linux)

Ah, I see. I鈥檒l update the README as soon as new version is available then. Please let me know
Just a heads up, ligatures are now working when using the kitty-git package from the AUR.
version 0.5.0 with ligature support has been released.
Awesome! Great work, thanks! Added it to the support table
so.. kitty != KiTTY, huh?
pretty confusing.. i was thinking of the putty fork: http://www.9bis.net/kitty/
took me a while to realize that this kitty is a completely different thing.
maybe the support table should get a note about this
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version 0.5.0 with ligature support has been released.