Format perfect-numbers config.json (#903)

Author: BNAndras

exercises/practice/perfect-numbers/.meta/config.json

@@ -1,13 +1,19 @@
 {
-   "title": "Perfect Numbers",
-   "blurb": "Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers.",
-   "source": "Taken from Chapter 2 of Functional Thinking by Neal Ford.",
-   "source_url": "https://www.oreilly.com/library/view/functional-thinking/9781449365509/",
-   "files": {
-      "test": ["perfect-numbers-test.lisp"],
-      "solution": ["perfect-numbers.lisp"],
-      "example": [".meta/example.lisp"]
-   },
-   "authors": ["Average-user"],
-   "contributors": []
+  "authors": [
+    "Average-user"
+  ],
+  "files": {
+    "solution": [
+      "perfect-numbers.lisp"
+    ],
+    "test": [
+      "perfect-numbers-test.lisp"
+    ],
+    "example": [
+      ".meta/example.lisp"
+    ]
+  },
+  "blurb": "Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers.",
+  "source": "Taken from Chapter 2 of Functional Thinking by Neal Ford.",
+  "source_url": "https://www.oreilly.com/library/view/functional-thinking/9781449365509/"
 }