Fix typo in simple-authentication.js

lib/middleware/simple-authentication.js

@@ -31,7 +31,7 @@ function unsecureAuthentication(app) {
                         path: '/api/admin/login',
                         type: 'unsecure',
                         message:
-                            'You have to indetify yourself in order to use Unleash.',
+                            'You have to indentify yourself in order to use Unleash.',
                     })
                 )
                 .end();