rm note

PMB_README.md

@@ -34,7 +34,8 @@ Then:
     vi .env
     docker-compose up -d
 
-Note: docker-compose down && docker-compose up are necessary. "restart" will not reload .env
+Note: docker-compose down && docker-compose up are necessary. "restart" will not reload .env\
+Note: username can be anything configured as account in protonmail web interface.
 
 ## msmtp test