[AIRFLOW-XXX] Added DataCamp to list of companies in README (apache#4009)

Author: dgrtwo

README.md

@@ -145,6 +145,7 @@ Currently **officially** using Airflow:
 1. [Custom Ink](https://www.customink.com/) [[@david-dalisay](https://github.com/david-dalisay), [@dmartin11](https://github.com/dmartin11) & [@mpeteuil](https://github.com/mpeteuil)]
 1. [Dailymotion](http://www.dailymotion.com/fr) [[@germaintanguy](https://github.com/germaintanguy) & [@hc](https://github.com/hc)]
 1. [Data Reply](https://www.datareply.co.uk/) [[@kaxil](https://github.com/kaxil)]
+1. [DataCamp](https://datacamp.com/) [[@dgrtwo](https://github.com/dgrtwo)]
 1. [DataFox](https://www.datafox.com/) [[@sudowork](https://github.com/sudowork)]
 1. [Digital First Media](http://www.digitalfirstmedia.com/) [[@duffn](https://github.com/duffn) & [@mschmo](https://github.com/mschmo) & [@seanmuth](https://github.com/seanmuth)]
 1. [DocuTAP](https://www.docutap.com/) [[@jshvrsn](https://github.com/jshvrsn) & [@lhvphan](https://github.com/lhvphan) & [@cloneluke](https://github.com/cloneluke)]