The package still uses version v1.6.2.
Current stable version is 3.5, see https://github.com/aFarkas/html5shiv/tree/3.5.
Related WordPress core tickets: #20755, #20640
Thanks for pointing this out! We'll do some testing and try to get the updated html5shiv into the next version of _s.
Looks like it's up to 3.6 now, as latest stable version.
Update html5shiv.js to 3.6 stable version, props ocean90