Add information about the Gerrit User Summit 2019 live

Author: lucamilanesio

rev_news/drafts/edition-56.md

@@ -238,6 +238,8 @@ __Various__
 * A new maintainer for Git-Gui, Pratyush Yadav (@prati0100),
 [came forward](https://public-inbox.org/git/[email protected]/).
  Let's praise and thank him for volunteering.
+* The Gerrit User Summit 2019 is going to be [broadcasted on live.gerritforge.com](https://live.gerritforge.com) and will
+ include talks about JGit and Gerrit Code Review, including major members of the Git Community, like Jonathan Nieder and Terry Parker.
 
 __Light reading__