Well, no, nobody said you need a library to help you write your README, but if you get tired of writing the same structure or making the the same updates over and over again, you can use this to automate some of that process if you so desire. Seems pretty nifty to me, though I may well never use it.

I really don't understand the mindset that takes people from "hey look somebody wrote a free piece of software I can use if I want" to "what, now I need to use yet another piece of software for something?"