Add Margin and Contract(features) extension

README.md

@@ -1066,10 +1066,10 @@ $api->miniTicker(function($api, $ticker) {
 
 #### Realtime Complete Chart Updates via WebSockets
 ```php
-$api->chart(["BNBBTC"], "15m", function($api, $symbol, $chart) {
+$api->chart(["BNBBTC"], function($api, $symbol, $chart) {
 	echo "{$symbol} chart update\n";
 	print_r($chart);
-});
+}, "15m");
 ```
 <details>
  <summary>View Response</summary>

composer.json

@@ -24,6 +24,7 @@
     },
     "autoload": {
         "classmap": [
+          "extensions/",
           "php-binance-api.php",
           "php-binance-api-rate-limiter.php"
         ]

examples/0.example.php

@@ -84,10 +84,10 @@
 
 
 // Get complete realtime chart data via WebSockets
-//$api->chart(["BNBBTC"], "15m", function($api, $symbol, $chart) {
+//$api->chart(["BNBBTC"], function($api, $symbol, $chart) {
 //    echo "{$symbol} chart update\n";
 //    print_r($chart);
-//});
+//}, "15m");
 
 
 // Grab realtime updated depth cache via WebSockets

examples/web_socket_chart.php

@@ -8,9 +8,9 @@
 $api = new Binance\API();
 
 // Get complete realtime chart data via WebSockets
-$api->chart(["BNBBTC"], "15m", function($api, $symbol, $chart) {
+$api->chart(["BNBBTC"], function($api, $symbol, $chart) {
     echo "{$symbol} chart update\n";
     print_r($chart);
     $endpoint = strtolower( $symbol ) . '@kline_' . "15m";
     $api->terminate( $endpoint );
-});
+}, "15m");