Merge pull request #857 from deepakavs/master

meetup: add topics

config.json

       "core": false,
       "difficulty": 7,
       "slug": "meetup",
-      "topics": null,
+      "topics": [
+        "conditionals",
+        "dates",
+        "loops",
+        "enumerations"
+      ],
       "unlocked_by": "gigasecond",
       "uuid": "602511d5-7e89-4def-b072-4dd311816810"
     },