add prerequisities for phone number exercise (#1575)

AnishDe12020 · web-flow · commit 95a7edaf59ac · 2021-12-23T10:06:01.000+01:00
diff --git a/config.json b/config.json
@@ -821,7 +821,12 @@
         "name": "Phone Number",
         "uuid": "82775adb-eabe-4d44-91f5-4080b8834a4a",
         "practices": [],
-        "prerequisites": [],
+        "prerequisites": [
+          "strings",
+          "comparison",
+          "conditionals",
+          "regular-expressions"
+        ],
         "difficulty": 3,
         "topics": ["parsing", "transforming"]
       },
