Add tracks attribute

Author: ajrice6713

lib/bandwidth/voice_lib/bxml/verbs/start_stream.rb

@@ -10,6 +10,7 @@ def to_bxml(xml)
         xml.StartStream(compact_hash({
          'destination' => destination,
          'name' => name,
+         'tracks' => tracks,
          'streamEventUrl' => streamEventUrl,
          'streamEventMethod' => streamEventMethod,
          'username' => username,

test/integration/test_integration.rb

@@ -690,11 +690,12 @@ def test_webrtc_generate_transfer_bxml_verb
     end
 
     def test_start_stream_bxml_verb
-        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>'
+        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>'
         response = Bandwidth::Voice::Response.new()
         start_stream = Bandwidth::Voice::StartStream.new({
             :destination => "https://www.test.com/stream",
             :name => "test_stream",
+            :tracks => "inbound",
             :streamEventUrl => "https://www.test.com/event",
             :streamEventMethod => "POST",
             :username => "username",