fix orders: Illegal characters

FIX - Illegal characters found in parameter \'orderId\'; legal range is \'^[0-9]{1,20}$\'.

Author: Max Grim

php-binance-api.php

@@ -449,7 +449,7 @@ public function openOrders(string $symbol = null)
      * @return array with error message or array of orderDetails array
      * @throws \Exception
      */
-    public function orders(string $symbol, int $limit = 500, int $fromOrderId = -1, array $params = []) {
+    public function orders(string $symbol, int $limit = 500, int $fromOrderId = 0, array $params = []) {
 	$params["symbol"] = $symbol;
 	$params["limit"] = $limit;
         if ( $fromOrderId ) $params["orderId"] = $fromOrderId;