Changed log printing on error only

vk/structs.go

@@ -11,3 +11,12 @@ type UserMessage struct {
 	Body   string `json:"text"`
 	UserId int64  `json:"peer_id"`
 }
+
+type SendMessageResponse struct {
+	Error ErrorResponse `json:"error"`
+}
+
+type ErrorResponse struct {
+	ErrorCode int    `json:"error_code"`
+	ErrorMsg  string `json:"error_msg"`
+}