Typos..

README.md

-# ansible script to setup multiple [otree](https://otree.readthedocs.io/en/latest/) instances with python env, gninx reverse proxy, supervisor and ufw
+# ansible script to setup multiple [otree](https://otree.readthedocs.io/en/latest/) instances with python env, nginx (as reverse proxy), supervisor (as process manager) and ufw (as firewall)
 
 ## preparation/ server setup