RxFlow Versions Save

This release:

• bumps RxSwift to version 5.1.1
• bumps to Swift 5.2.2

This release brings:

• SwifLint rules improvements
• An "adapt" feature in Flows
• Imports sanitization
• Documentation updates
• Unit tests for Flows
• Single.zip instead of Observable.zip

• It is now possible to bypass the default behaviour of a FlowCoordinator and make it listen for steps emitted while the associated presentable is not currently visible (see FlowContributor.contribute(withNextPresentable: Presentable, withNextStepper: Stepper, allowStepWhenNotPresented: Bool = false)
• Makes framework use only extensions APIs for debug and archive

• FlowContributor.contribute(withNext:): shortcut function in case we have a single actor that is a Presentable and also a Stepper
• add SPM support (thanks to @MortyMerr)
• switch to GitHub Actions for the CI
• add a tech talk reference in the README file
• bump to Swift 5.1

This release contains the following improvements:

• CI is now performed by CircleCI
• FlowContributors.multiple has been extended to handle all kinds of FlowContributor (https://github.com/RxSwiftCommunity/RxFlow/pull/121) thanks to @MortyMerr.

• bump to RxSwift 5.0.1 (thanks to @rynecheow)

• Bump to Swift 5.0.1

• enable code coverage
• bump RxSwift to 4.5.0
• bump swift version to 5.0

• Coordinator has been renamed in FlowCoordinator
• NextFlowItem and NextFlowItems have been renamed in FlowContributor and FlowContributors
• The FlowContributors enum entry .end (withStepForParentFlow: Step) has been renamed in .end (forwardToParentFlowWithStep: Step)
• The FlowContributor class has been converted to an enum
• In an effort to minimize the usage of objc_get/setAssociatedObject, each custom Stepper must declare a stored property steps as a PublishRelay<Step>
• To trigger an initial Step inside a Stepper, an initialStep property has to be implemented
• The callback function readyToEmitSteps() has been added to a Stepper. It is called once the Stepper can emit Steps
• The reactive step property of a Stepper has been renamed in steps to reflect the plurality of the sequence
• FlowCoordinator has been totally rewritten to improve memory management
• HasDisposeBag has been removed from the project as it was not mandatory in the implementation and is not really related to RxFlow
• The RxFlowStep enum is now provided to offer some common steps that can be used in lots of applications
• Some of the old data structure names are still usable but have been explicitly deprecated

fix: memory leaks when ending flows with sibling flows. See https://github.com/RxSwiftCommunity/RxFlow/issues/92