cs: Enable a couple of risky rules.

src/Bundle/ChillMainBundle/Security/UserProvider/UserProvider.php

@@ -42,7 +42,7 @@ class UserProvider implements UserProviderInterface
                 ->getSingleResult();
         } catch (NoResultException $e) {
             throw new UsernameNotFoundException(
-                sprintf('Bad credentials.'),
+                'Bad credentials.',
                 0,
                 $e
             );