RxSwift 5.+ Support

[foxware00]

Currently, the builds support RxSwift 4.+ which is incompatible when using RxSwift 5.0.+ in the project. Making this unavailable to use with Swift 5 projects. Happy to open a PR, but will need some guidance getting the project working locally.

[dangthaison91]

@foxware00 You can simply run Carthage to update dependencies then you can start on Swift 5.0 migration.

[foxware00]

@dangthaison91 opened a PR #33. I've never used Carthage before so wasn't 100% sure what to upload. Just updated dependencies and did some very minor changes to support swift 5

[foxware00]

@dangthaison91 Do we need to do anything special to get the latest library version in cocoapods?

[dangthaison91]

@foxware00 Texture just stopped support iOS 8.0 in 2.8.1. I just set podspec to iOS 9.0 and trunk pod version to 0.4.