Currently there's a workaround for this issue where you can download and use a Mac program called gfxCardStatus, allowing you to switch between three options for your MacBook Pro's graphics cards (Dynamic Switching, Discrete Only, Integrated Only).
(Please note that this software was not developed or supported by Klei Entertainment and you must use it at your own risk.)
What happens is when you choose "Integrated Only," it will force your MacBook to use your default integrated graphics card and not the other card; causing your game to crash.
More information about this issue and workaround here: https://forums.kleientertainment.com/forums/topic/10345-shank-mac-crashing-work-around/