Check for Stream parameter usage (#174)

* check for stream:true usage

* lint

chat.go

@@ -14,7 +14,8 @@ const (
 )
 
 var (
-	ErrChatCompletionInvalidModel = errors.New("currently, only gpt-3.5-turbo and gpt-3.5-turbo-0301 are supported")
+	ErrChatCompletionInvalidModel       = errors.New("currently, only gpt-3.5-turbo and gpt-3.5-turbo-0301 are supported")                 //nolint:lll
+	ErrChatCompletionStreamNotSupported = errors.New("streaming is not supported with this method, please use CreateChatCompletionStream") //nolint:lll
 )
 
 type ChatCompletionMessage struct {
@@ -65,8 +66,12 @@ func (c *Client) CreateChatCompletion(
 	ctx context.Context,
 	request ChatCompletionRequest,
 ) (response ChatCompletionResponse, err error) {
-	model := request.Model
-	switch model {
+	if request.Stream {
+		err = ErrChatCompletionStreamNotSupported
+		return
+	}
+
+	switch request.Model {
 	case GPT3Dot5Turbo0301, GPT3Dot5Turbo, GPT4, GPT40314, GPT432K0314, GPT432K:
 	default:
 		err = ErrChatCompletionInvalidModel