Replace voice name with voice style in NCCO

docs/examples/ncco.md

@@ -28,6 +28,12 @@ Create a `talk` action to read some text into the call:
 	talk := ncco.TalkAction{Text: "Greetings from the golang library", VoiceName: "Nicole"}
 ```
 
+or
+
+```go
+	talk := ncco.TalkAction{Text: "Greetings from the golang library", Style: 0, Language: "en-US}
+```
+
 ## Notify Action
 
 Use `notify` to send a particular data payload to a nominated URL:

docs/examples/voice.md

@@ -262,7 +262,7 @@ func main() {
 
     result, _, _:= client.PlayTts("aaaabbbb-0000-1111-2222-abcdef01234567",
         "Hello, my friend",
-        vonage.PlayTtsOpts{Loop: 2, VoiceName: "Russell"}
+        vonage.PlayTtsOpts{Loop: 2, Style: 0, Language: "en-US"}
     )
     // or to stop an in-progress TTS
     // result, _, _:= client.StopTts("aaaabbbb-0000-1111-2222-abcdef01234567")

ncco/ncco.go

@@ -42,6 +42,8 @@ type TalkAction struct {
 	BargeIn             bool   `json:"bargeIn"`
 	Level               int    `json:"level,omitempty"`
 	VoiceName           string `json:"voiceName,omitempty"`
+	Style               int    `json:"style,omitempty"`
+	Language            string `json:"language,omitempty"`
 	CalculatedLoopValue int    `json:"loop"`
 }
 

voice.go

@@ -437,6 +437,8 @@ type PlayTtsOpts struct {
 	Loop      int32
 	Level     string
 	VoiceName string
+	Style     int32
+	Language  string
 }
 
 // PlayTts starts playing TTS into the call