Add trade fee function

the function requests the updated trade fee of peer/symbol offered by binance in percentage

php-binance-api.php

@@ -547,6 +547,25 @@ public function assetDetail()
  $params["wapi"] = true;
  return $this->httpRequest("v3/assetDetail.html", 'GET', $params, true);
  }
+
+
+ /**
+ * Fetch current(daily) trade fee of symbol, values in percentage.
+ * for more info visit binance official api document
+ *
+ * $symbol = "BNBBTC"; or any other symbol or even a set of symbols in an array
+ * @param string $symbol
+ * @return mixed
+ */
+ public function tradeFee(string $symbol)
+ {
+ $params = [
+ "symbol" => $symbol,
+ "wapi" => true,
+ ];
+
+ return $this->httpRequest("v3/tradeFee.html", 'GET', $params, true);
+ }
 
  /**
  * withdraw requests a asset be withdrawn from binance to another wallet