Merge pull request #860 from puripant/patch-1

Add topics to pascals-triangle

config.json

       "core": false,
       "difficulty": 5,
       "slug": "pascals-triangle",
-      "topics": null,
+      "topics": [
+        "arrays",
+        "matrices",
+        "algorithms",
+        "mathematics",
+        "exception_handling",
+        "integers"
+      ],
       "unlocked_by": "matrix",
       "uuid": "d2a76905-1c8c-4b03-b4f7-4fbff19329f3"
     },