options: add protect

options.go

@@ -25,6 +25,9 @@ const (
 	// AllowWithoutReply = SendOptions.AllowWithoutReply
 	AllowWithoutReply
 
+	// Protected = SendOptions.Protected
+	Protected
+
 	// ForceReply = ReplyMarkup.ForceReply
 	ForceReply
 

util.go

@@ -160,6 +160,8 @@ func extractOptions(how []interface{}) *SendOptions {
 					opts.ReplyMarkup = &ReplyMarkup{}
 				}
 				opts.ReplyMarkup.RemoveKeyboard = true
+			case Protected:
+				opts.Protected = true
 			default:
 				panic("telebot: unsupported flag-option")
 			}