update readme to deal with buildpacks
update readme to deal with buildpacks

twitterdev/django-signin-and-apis,twitterdev/django-rest-apis,twitterdev/django-rest-apis,twitterdev/django-signin-and-apis,twitterdev/django-rest-apis,twitterdev/django-signin-and-apis,twitterdev/django-rest-apis,twitterdev/django-signin-and-apis