[AIRFLOW-634] Add lumoslabs to readme

Closes apache#1887 from rfroetscher/add_lumoslabs

README.md

@@ -106,7 +106,7 @@ Currently **officially** using Airflow:
 1. [HelloFresh](https://www.hellofresh.com) [[@tammymendt](https://github.com/tammymendt) & [@davidsbatista](https://github.com/davidsbatista) & [@iuriinedostup](https://github.com/iuriinedostup)]
 1. [Holimetrix](http://holimetrix.com/) [[@thibault-ketterer](https://github.com/thibault-ketterer)]
 1. [Hootsuite](https://github.com/hootsuite)
-1. [IFTTT](https://www.ifttt.com/) [[@apurvajoshi](https://github.com/apurvajoshi)]   
+1. [IFTTT](https://www.ifttt.com/) [[@apurvajoshi](https://github.com/apurvajoshi)]
 1. [iHeartRadio](http://www.iheart.com/)[[@yiwang](https://github.com/yiwang)]
 1. [ING](http://www.ing.com/)
 1. [Jampp](https://github.com/jampp)
@@ -116,6 +116,7 @@ Currently **officially** using Airflow:
 1. [liligo](http://liligo.com/) [[@tromika](https://github.com/tromika)]
 1. [LingoChamp](http://www.liulishuo.com/) [[@haitaoyao](https://github.com/haitaoyao)]
 1. [Lucid](http://luc.id) [[@jbrownlucid](https://github.com/jbrownlucid) & [@kkourtchikov](https://github.com/kkourtchikov)]
+1. [Lumos Labs](https://www.lumosity.com/) [[@rfroetscher](https://github.com/rfroetscher/) & [@zzztimbo](https://github.com/zzztimbo/)]
 1. [Lyft](https://www.lyft.com/)[[@SaurabhBajaj](https://github.com/SaurabhBajaj)]
 1. [Madrone](http://madroneco.com/) [[@mbreining](https://github.com/mbreining) & [@scotthb](https://github.com/scotthb)]
 1. [Markovian](https://markovian.com/) [[@al-xv](https://github.com/al-xv), [@skogsbaeck](https://github.com/skogsbaeck), [@waltherg](https://github.com/waltherg)]