add check http response and caption_entities field

bot.go

@@ -63,11 +63,17 @@ func (bot *BotAPI) MakeRequest(endpoint string, params url.Values) (APIResponse,
 	method := fmt.Sprintf(APIEndpoint, bot.Token, endpoint)
 
 	resp, err := bot.Client.PostForm(method, params)
+
 	if err != nil {
 		return APIResponse{}, err
 	}
 	defer resp.Body.Close()
 
+	// Check http response status
+	if resp.StatusCode != 200 {
+		return APIResponse{}, errors.New(resp.Status)
+	}
+
 	var apiResp APIResponse
 	bytes, err := bot.decodeAPIResponse(resp.Body, &apiResp)
 	if err != nil {

types.go

@@ -142,6 +142,7 @@ type Message struct {
 	EditDate              int                `json:"edit_date"`               // optional
 	Text                  string             `json:"text"`                    // optional
 	Entities              *[]MessageEntity   `json:"entities"`                // optional
+	CaptionEntities       *[]MessageEntity   `json:"caption_entities"`        // optional
 	Audio                 *Audio             `json:"audio"`                   // optional
 	Document              *Document          `json:"document"`                // optional
 	Game                  *Game              `json:"game"`                    // optional