Update dependency io.reactivex.rxjava2:rxkotlin to v2.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.reactivex.rxjava2:rxkotlin	2.2.0 -> 2.4.0

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Release Notes

ReactiveX/RxKotlin (io.reactivex.rxjava2:rxkotlin)

v2.4.0: RxKotlin 2.4.0

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• Kotlin updated to 1.3.40
• RxJava updated to 2.2.10
• Migrated to Gradle 5.4.1 and Gradle Kotlin DSL

v2.3.0: RxKotlin 2.3.0

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This is the first release for RxKotlin in quite some time. I apologize it took so long.

• RxJava updated to 2.2.0
• Kotlin updated to 1.2.60
• Silence unused and platform warnings #​179
• Add missing @​CheckReturnValue annoations #​180
• Add zero-arg flatMapIterable and concatMapIterable #​185
• Make cast and ofType operate on wildcard types rather than Any #​176
• Add Flowables.create with lambda as last parameter #​188
• Change return type of Flowable.withLatestFrom #​193

Thank you everyone for your contributions!

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