add retry mechanism for chain

cmd/gost/main.go

@@ -60,8 +60,6 @@ func init() {
 		fmt.Fprintf(os.Stderr, "gost %s (%s)\n", gost.Version, runtime.Version())
 		os.Exit(0)
 	}
-
-	log.Log("Debug:", gost.Debug)
 }
 
 func main() {

cmd/gost/peer.json

+{
+    "strategy": "round",
+    "max_fails": 3,
+    "fail_timeout": 30,
+    "nodes":[
+        "socks5://:1081",
+        "socks://:1082",
+        "socks4a://:1083"
+    ]
+}
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