Update README.md

[gfggithubleet]

typo fixed

[t-fritsch]

thanks for the PR !
why do you think every item in this list should be with a capitalized first letter ?
It makes sense for Markdown, LaTex, and PDF (since their names are with uppercase first letter), but every other item in this sentence should stay lowercase imo

I wondered if Auto-Animate should be lower-case or not but it's written this way in the documentation https://revealjs.com/auto-animate/ :

All you need to do is add data-auto-animate to two adjacent slide <section> elements and Auto-Animate will animate all matching elements between the two.