Updated Awesome-gatsby file to include link to Gatsby Days Playlist (#10572)

Author: lannonbr

docs/docs/awesome-gatsby.md

@@ -33,6 +33,7 @@ See the [library of official and community plugins](/plugins/)
 
 ## Videos
 
+- [Gatsby Days Bay Area December 2018 - Kyle Mathews & Guest Speakers](https://www.youtube.com/playlist?list=PLCU2qJekvcN1wzgVKymbjbGtZ3VgAWOdj)
 - [Static Site Generation with Gatsby.js v0 — Scott Nonnenberg](https://blog.scottnonnenberg.com/static-site-generation-with-gatsby-js/)
 - [React.js Conf 2016 - Lightning Talks - Kyle Mathews](https://www.youtube.com/watch?v=RFkNRKL6ZoE)
 - [Developing with React and Gatsby.js — Kyle Mathews](https://www.youtube.com/watch?v=G4LVKJOOj7o)