Update README.md with correct URL

Author: 13rac1

examples/flask_sqlalchemy/README.md

@@ -46,5 +46,5 @@ Now the following command will setup the database, and start the server:
 
 
 Now head on over to
-[http://127.0.0.1:5000/graphiql](http://127.0.0.1:5000/graphiql)
+[http://127.0.0.1:5000/graphql](http://127.0.0.1:5000/graphql)
 and run some queries!