[Swift 3] Mark Store as Open
[Swift 3] Mark Store as Open

In order to not break backwards compatibility, the Store type should be marked open until the next major release.

Swift-Flow/Swift-Flow,ReSwift/ReactiveReSwift,ycfreeman/ReSwift,mpsnp/ReSwift,Swift-Flow/Swift-Flow,Swift-Flow/Swift-Flow,mpsnp/ReSwift,ReSwift/ReSwift,Swift-Flow/Swift-Flow,ycfreeman/ReSwift,ycfreeman/ReSwift,ycfreeman/ReSwift,ReSwift/ReactiveReSwift,Swift-Flow/Swift-Flow,ReSwift/ReactiveReSwift,mpsnp/ReSwift,ReSwift/ReSwift,ycfreeman/ReSwift,ReSwift/ReSwift