config.json in trackler-2.2.0.5

- old
+ new

@@ -1,8 +1,6 @@
 {
-  "slug": "sml",
   "language": "Standard ML",
-  "repository": "https://github.com/exercism/sml",
   "checklist_issue": 8,
   "active": false,
   "test_pattern": "^test_*.sml$",
   "exercises": [
     {