Swiftmoji question

So I'm using this new Swiftmoji keyboard and they have a feature where it'll show the diverse emoji after you long press. Problem is this feature only works with Android nougat. I have a rooted device with marshmallow, and the modified emojis to show diverse emojis, and it works fine with Google, and chrooma keyboard. My question is how can I "trick" the keyboard to think I'm on nougat to get this feature working? I've tried editing the build number in the build.prop but it didn't work.

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