Add The Big Elixir conference (#91)

Added an Elixir conference we just announced - thanks for creating and upkeeping this repo!

Author: joeellis

README.md

@@ -6,6 +6,7 @@
 ***
 
 ## November 2018
+- :star: (November 8-9) [The Big Elixir](https://www.thebigelixir.com) (New Orleans, LA USA) - The Big Elixir is a two-day, single track conference created to help developers take their Elixir skills to the next level. 
 - :star: (November 9) [dotJS 2018](https://www.dotjs.io) (Paris, France) - The largest JavaScript conference in Europe
 - :star: (November 8) [dotCSS 2018](https://www.dotcss.io) (Paris, France) - The largest CSS conference in Europe