Fix Heroku dyno command

Got this error while running: $ heroku ps:scale app=1
Scaling dynos... failed
 !    No such process type app defined in Procfile.

So, I fixed the command to work with your Procfile :) But in actuality, I didn't need to run the dyno command since the web dyno was 1 after "git push heroku master" completes for me. But it never hurts to be explicit when sending Heroku commands.