• Compatibility with Xcode 10.0
• Adds new insert extension to collect and add multiple disposables to DisposeBag.
• Adds scan(into:accumulator:).
• Adds queuePriority parameter (defaults to .normal) to OperationQueueScheduler.
• Performance enhancement reduces Bag dispatch inline code size by 12%.
• Adds customCaptureSubscriptionCallstack hook to allow custom subscription callstacks to be generated.
• Remove usage of Variable from Playground, Example projects and Tests.
• Add XCTAssertRecordedElements to XCTest+Rx.

Anomalies

• Fix build issues on new arm64_32 architecture (watchOS 5).
• Removes string interpolation warning.