Looks like 3D Touch is going away and deleting apps on your iPhone just got a little longer.
There are two ways to do this in iOS 13.
The first way is to tap and hold until you see the menu as follows
You can then tap ‘rearrange apps’ and then you’ll see them jiggling around as normal.
You can then tap the ‘X’ as you would in iOS 12.
The second way is to keep holding your finger down when the menu for rearranging apps has popped up. Apps will start to jiggle and you can delete as normal.