Update _default.cfg

lgsm/config-default/config-lgsm/stserver/_default.cfg

@@ -64,9 +64,13 @@ pushoveralert="off"
 pushovertoken="accesstoken"
 
 # Telegram Alerts | https://github.com/GameServerManagers/LinuxGSM/wiki/Telegram
+# You can add a custom cURL string eg proxy (useful in Russia) or else in "curlcustomstring".
+# like a "--socks5 ipaddr:port" for socks5 proxy see more in "curl --help", if you not need 
+# any custom string in curl - simple ignore this parameter.
 telegramalert="off"
 telegramtoken="accesstoken"
 telegramchatid=""
+curlcustomstring=""
 
 ## Updating | https://github.com/GameServerManagers/LinuxGSM/wiki/Update
 updateonstart="off"