Set difficulty to 1 for exercises which difficulty is currently 0.

See exercism/docs#290 and exercism/configlet#447.

Author: ErikSchierboom

config.json

@@ -1109,7 +1109,7 @@
         "uuid": "cf3386ef-177c-41f6-8569-040d3a9c9175",
         "practices": [],
         "prerequisites": [],
-        "difficulty": 0,
+        "difficulty": 1,
         "topics": null,
         "status": "deprecated"
       }