readme alert subtypes are missing the text attribute

[KonradHoeffner]

Is:

dhtmlx.message({ type:"error", "Critical error!"});
//or
dhtmlx.message({ type:"alert-error", "Critical error!"});
 //or
dhtmlx.message({ type:"confirm-error", "Confirm self-destruction!"});

Should be:

dhtmlx.message({ type:"error", text:"Critical error!"});
//or
dhtmlx.message({ type:"alert-error", text:"Critical error!"});
 //or
dhtmlx.message({ type:"confirm-error", text:"Confirm self-destruction!"});