Update README.rst

Improved dj_database_url example

Author: Koed00

README.rst

@@ -22,8 +22,7 @@ If you're using the `dj-database-url <https://crate.io/packages/dj-database-url/
 
     import dj_database_url
 
-    DATABASES['default'] = dj_database_url.config()
-    DATABASES['default']['ENGINE'] = 'django_postgrespool'
+    DATABASES = {'default': dj_database_url.config(engine='django_postgrespool')}
 
 If you're using `south <http://south.aeracode.org>`_:
 
@@ -70,4 +69,4 @@ Check out the official `SQLAlchemy Connection Pooling <http://docs.sqlalchemy.or
 Django 1.3 Support
 ------------------
 
-django-postgrespool currently supports Django 1.4 and greater. See `this ticket <https://github.com/kennethreitz/django-postgrespool/pull/9>`_ for 1.3 support.
+django-postgrespool currently supports Django 1.4 and greater. See `this ticket <https://github.com/kennethreitz/django-postgrespool/pull/9>`_ for 1.3 support.