Add Lyft and Twitter to list of companies (#3789)

README.md

@@ -182,6 +182,7 @@ the world know they are using Superset. Join our growing community!
  - [Faasos](http://faasos.com/)
  - [GfK Data Lab](http://datalab.gfk.com)
  - [Konfío](http://konfio.mx)
+ - [Lyft](https://www.lyft.com/)
  - [Maieutical Labs](https://cloudschooling.it)
  - [Pronto Tools](http://www.prontotools.io)
  - [Qunar](https://www.qunar.com/)
@@ -190,6 +191,7 @@ the world know they are using Superset. Join our growing community!
  - [Tails.com](https://tails.com)
  - [Tobii](http://www.tobii.com/)
  - [Tooploox](https://www.tooploox.com/)
+ - [Twitter](https://twitter.com/)
  - [Udemy](https://www.udemy.com/)
  - [VIPKID](https://www.vipkid.com.cn/)
  - [Yahoo!](https://yahoo.com/)