Update composer.json

See http://getcomposer.org/doc/04-schema.md for details on the schema
Name "SchumacherFM/OptimizedBackendLogin" does not match the best practice (e.g. lower-cased/with-dashes). We suggest using "schumacher-fm/optimized-backend-login" instead. As such you will not be able to submit it to Packagist.