close scp connection after sending file

main.go

@@ -69,6 +69,7 @@ func gzipAndSend(l []byte) {
 		fmt.Printf(err.Error() + "\n")
 		return
 	}
+	defer client.Close()
 	t := time.Now()
 	date := t.Format("20060102150405")
 	client.CopyFile(r, *filePrefix+date+".gz", "0644")