feat: model_id tag add omitempty (#3)

* Fix compile error from variable typo

* bytes.Buffer pointer

client/tts.go

@@ -1,7 +1,6 @@
 package client
 
 import (
-	"bufio"
 	"bytes"
 	"context"
 	"encoding/json"
@@ -74,19 +73,17 @@ func (c Client) TTS(ctx context.Context, text, voiceID, modelID string, options
 	req.Header.Set("User-Agent", "github.com/taigrr/elevenlabs")
 	req.Header.Set("accept", "audio/mpeg")
 	res, err := client.Do(req)
-
+	if err != nil {
+		return []byte{}, err
+	}
 	switch res.StatusCode {
 	case 401:
 		return []byte{}, ErrUnauthorized
 	case 200:
-		if err != nil {
-			return []byte{}, err
-		}
 		b := bytes.Buffer{}
-		w := bufio.NewWriter(&b)
 
 		defer res.Body.Close()
-		io.Copy(w, res.Body)
+		io.Copy(&b, res.Body)
 		return b.Bytes(), nil
 	case 422:
 		fallthrough
@@ -120,14 +117,13 @@ func (c Client) TTSStream(ctx context.Context, w io.Writer, text, voiceID string
 	req.Header.Set("User-Agent", "github.com/taigrr/elevenlabs")
 	req.Header.Set("accept", "audio/mpeg")
 	res, err := client.Do(req)
-
+	if err != nil {
+		return err
+	}
 	switch res.StatusCode {
 	case 401:
 		return ErrUnauthorized
 	case 200:
-		if err != nil {
-			return err
-		}
 		defer res.Body.Close()
 		io.Copy(w, res.Body)
 		return nil

client/types/types.go

@@ -19,7 +19,7 @@ type Voice struct {
 	Labels      string     `json:"labels,omitempty"`      // Serialized labels dictionary for the voice.
 }
 type TTS struct {
-	ModelID       string           `json:"model_id"`
+	ModelID       string           `json:"model_id,omitempty"`
 	Text          string           `json:"text"`                     // The text that will get converted into speech. Currently only English text is supported.
 	VoiceSettings SynthesisOptions `json:"voice_settings,omitempty"` // Voice settings are applied only on the given TTS request.
 }