Credit to ramon31 for pointing this out in the Goat Simulator thread. The Hitman Essentials bundle is on sale for $1.99 at the moment. If you previously purchased either game for $1.99 or above, you can get the other for free using Complete My Bundle. If you've not played either before, $1.99 is still a great price for both games, or you can get just Hitman GO for $0.99.
Nice. That even works if (like me) you got Hitman Go through the IGN free game of the month. Cheers!!
I just tried some others. It also works if you got Goat Simulator: Goat Simulator Goat Pack by Coffee Stain Studios https://appsto.re/gb/PDXZ_.i