Breaking API Changes:

• Drop support for Swift 3.2, 4.0, and 4.1. (#418) - @DivineDominion
• Drop support for iOS 8 (#447) - @DominicSchiller-IBM-CIC

API Changes:

• Add capability to mutate Middleware after store creation. (#427) - @mjarvis

Other:

• Add key paths to subscription select (#415) - @djtech42
• Make isDispatching of Store atomic (#341, #446) - @zhongwuzw, @basememara