Add inet6_address for sing-box

v2rayN/v2rayN/Sample/tun_singbox_inbound

@@ -1,11 +1,12 @@
 {
-   "type":"tun",
+  "type": "tun",
-   "tag":"tun-in",
+  "tag": "tun-in",
-   "interface_name":"singbox_tun",
+  "interface_name": "singbox_tun",
-   "inet4_address":"172.19.0.1/30",
+  "inet4_address": "172.19.0.1/30",
-   "mtu":9000,
+  "inet6_address": "fdfe:dcba:9876::1/126",
-   "auto_route":true,
+  "mtu": 9000,
-   "strict_route":false,
+  "auto_route": true,
-   "stack":"system",
+  "strict_route": false,
-   "sniff":true
+  "stack": "system",
+  "sniff": true
 }