add lit3 launch event

Author: Robert Irwin

README.md

@@ -525,6 +525,7 @@ CSS Shadow Parts allow developers to expose certain elements inside Shadow DOM f
 
 ### Presentations
 
+- [Lit 3.0 Launch Event](https://www.youtube.com/watch?v=ri9FEl_hRTc)
 - [Are Web Components the Betamax of web development?](https://noti.st/lostinbrittany/EjUZyd/are-web-components-the-betamax-of-web-development) by [@lostinbrittany](https://twitter.com/lostinbrittany)
 - [Designing Standard Systems](https://drive.google.com/file/d/1ALFiWOFU0UAGUpaZPMIVnoADs9_REtL5/view) by [@stefsull](https://twitter.com/stefsull) and [@bferrua](https://twitter.com/bferrua)
 - [Frontend Architecture for Scalable Design Systems](https://events.drupal.org/seattle2019/sessions/design-system-architecture-pattern-lab-twig-and-web-components) by [@salem_cobalt](https://twitter.com/salem_cobalt)
@@ -605,7 +606,6 @@ The only notable exception is that customized built-in elements are rejected by
 - [@webcomponents/template](https://github.com/webcomponents/polyfills/tree/master/packages/template) - Minimal polyfill for `<template>`.
 - [@ungap/import-node](https://github.com/ungap/import-node) - An `importNode` polyfill for IE11 by [ungap project](https://ungap.github.io).
 
-
 ### History
 
 The articles below represent a long story of the Web Components specifications on the way towards the standardization.