0.20.0-RC3

Version 0.20.0-RC3 preview release fixes several bugs related to backpressure and adds retryWhen, repeatWhen for more advanced recursion use cases like retry with exponential backoff.

This version passed the Netflix API production canary process. Please test this against your code to help us find any issues before we release 0.20.0.

• Pull 1493 retryWhen/repeatWhen
• Pull 1494 zipWith
• Pull 1501 blocking synchronous next
• Pull 1498 non-deterministic testUserSubscriberUsingRequestAsync
• Pull 1497 spsc ring buffer concurrency test
• Pull 1496 Change RxRingBuffer Queue Usage
• Pull 1491 Concat Outer Backpressure
• Pull 1490 non-deterministic timeouts on slow machines
• Pull 1489 Backpressure Fixes and Docs
• Pull 1474 Ignore backpressure for OperatorToObservableSortedList
• Pull 1473 OperatorAny needs to handle backpressure
• Pull 1472 Add test of backpressure to OperatorAll
• Pull 1469 ToList operator needs to ignore backpressure
• Pull 1393 Add cache(int capacity) to Observable
• Pull 1431 CompositeException fix for Android
• Pull 1436 Correct warnings

Artifacts: Maven Central