Update app.json

Author: kyb3r

app.json

@@ -12,7 +12,7 @@
         "required": true
     },
     "PREFIX": {
-        "description": "Command prefix to use.",
+        "description": "Command prefix to use, default is `?`",
         "required": false
     },
     "STATUS": {
@@ -27,9 +27,9 @@
         "description": "Comma seperated user IDs of people that are allowed to use owner only commands. (eval and update)",
         "required": false
     },
-    "GITHUB_ACCESS_TOKEN": {
-        "description": "Github personal access token to enable use of the update command.",
-        "required": false
+    "MODMAIL_API_TOKEN": {
+        "description": "Api token from https://dashboard.modmail.tk",
+        "required": true
     }
   }
 }