The Apple Developer website says:
Note
With Xcode 7.1, you must develop on a device that supports 3D Touch. The simulator in Xcode 7.1 does not support 3D Touch.
Apparently, the new Simulator 9.1 does not support 3D Touch. In fact, you can implement this behavior, but (unfortunately) you need to test it on a real device that supports 3D Touch.
I think we all have to wait for the next release of Xcode.
See here for a similar discussion and a way to check the touch force for quick actions only (on the app icon).
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