PublicIP: add option --publicip-ipv6

src/data/help.json

@@ -1348,6 +1348,14 @@
                 "type": "str"
             }
         },
+        {
+            "long": "publicip-ipv6",
+            "desc": "Whether to use IPv6 for public IP detection server",
+            "arg": {
+                "type": "bool",
+                "default": false
+            }
+        },
         {
             "long": "weather-location",
             "desc": "Set the location to be used",