Update core/components/getfeed/snippet.getfeed.php

[bertoost]

Added "idx" and "limit" to item placeholders to being able to decide wheter or not in the last entry.

[[+idx:lt=`[[+limit]]`:then=`when not the last`:else=`when last`]]

I use it to separate my items. The [[+total]] placeholder is containing the absolute total and not the limited total.