Merge pull request #49 from tay/docs-env-var

[docs] Remove extraneous Heroku config

README.md

@@ -204,7 +204,6 @@ NB: These instructions are for the basic authentication strategy.
     heroku run rake db:migrate
     heroku config:add REST_AUTH_SITE_KEY=<unique, private and long alphanumeric key, e.g. abcd1234edfg78910>
     heroku config:add REST_AUTH_DIGEST_STRETCHES=<count of number of times to apply the digest, 10 recommended>
-    heroku labs:enable user-env-compile
     heroku run console 
 
 When inside the console, run the creating a new user step above. You should then be able to access your server and start using it.