Swift4.1 Support

[beryu]

I use VueFlux with Carthage.
VueFlux has the error below after update Xcode to 9.3.

Module compiled with Swift 4.0.3 cannot be imported in Swift 4.1: /Path/to/VueFlux.framework/Modules/VueFlux.swiftmodule/x86_64.swiftmodule

Do you plan to update for this?
Thanks

[beryu]

Also, I try to build with Carthage's --no-use-binaries option but failed to build by error below.

While emitting IR SIL function "@_T07VueFlux8ExecutorV015MainThreadInnerC033_CA010519110FC26C1E89058BA722AAD8LLC7executeyyycF".
 for 'execute(_:)' at /Path/to/VueFlux/Executor.swift:62:9

I think it is Swift compiler's bug, but please fix it if you could.

[ra1028]

@beryu
Thanks for the report!
Fixed by @naoto0n2 in #25.
It seemed to be a bug in Swift compiler, so I just released workaround as tag 1.4.1.