#636 (version 2.0.1) broke IE11 support due to Array.from

[samcic]

#636 (version 2.0.1) introduced the check:

!Array.from(shoeboxNodes).includes(nextNode)

IE11 doesn't support Array.from. My understanding is that Ember and Fastboot officially support IE11, so this is a regression.

PR with a fix coming...