Add tracks attribute

Bandwidth.Standard/Voice/Bxml/StartStream.cs

@@ -21,6 +21,11 @@ public class StartStream : IXmlSerializable, IVerb, IAudioProducer
     /// </summary>
     public string Name { get; set; }
 
+    /// <summary>
+    /// The part of the call to send a stream from. `inbound`, `outbound` or `both`.
+    /// </summary>
+    public string Tracks { get; set; }
+
     /// <summary>
     /// URL to send the associated Webhook events to during this stream's lifetime
     /// </summary>
@@ -58,6 +63,10 @@ void IXmlSerializable.WriteXml(XmlWriter writer)
       {
         writer.WriteAttributeString("name", Name);
       }
+      if (!string.IsNullOrEmpty(Tracks))
+      {
+        writer.WriteAttributeString("tracks", Tracks);
+      }
       if (!string.IsNullOrEmpty(StreamEventUrl))
       {
         writer.WriteAttributeString("streamEventUrl", StreamEventUrl);

Bandwidth.StandardTests/Voice/Bxml/StreamTests.cs

@@ -9,10 +9,11 @@ public class StreamTests
         [Fact]
         public void StartStreamBxmlVerbTest()
         {
-            var expected = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Response>  <StartStream destination=\"https://www.test.com/stream\" name=\"test_stream\" streamEventUrl=\"https://www.test.com/event\" streamEventMethod=\"POST\" username=\"username\" password=\"password\" /></Response>";
+            var expected = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Response>  <StartStream destination=\"https://www.test.com/stream\" name=\"test_stream\" tracks =\"inbound\" streamEventUrl=\"https://www.test.com/event\" streamEventMethod=\"POST\" username=\"username\" password=\"password\" /></Response>";
             var startStream = new StartStream();
             startStream.Destination = "https://www.test.com/stream";
             startStream.Name = "test_stream";
+            startStream.Tracks = "inbound";
             startStream.StreamEventUrl = "https://www.test.com/event";
             startStream.StreamEventMethod = "POST";
             startStream.Username = "username";