Please, add "LAST-MODIFIED" to the event properties

[jhernandis]

I miss the LAST-MODIFIED property for the events items. Can you add it? Thanks.

[rubenvanassche]

You're always welcome to send in a PR adding this!

[jhernandis]

Great! I'll try it.

[jhernandis]

Meanwhile, I've added this code to our ICS generator:
$icsEvent->appendProperty(DateTimeProperty::create('LAST-MODIFIED', new DateTimeValue(new DateTime($ev->event_updated, $tz))));