1.6.0-RC2

• @ExperimentalTime is no longer needed for methods that use Duration (#3041).
• FlowCollector is now fun interface, and corresponding inline extension is removed (#3047).
• Fixed the exception handler being invoked several times on Android, thanks to @1zaman (#3056).
• The deprecated TestCoroutineScope is no longer sealed, to simplify migration from it (#3072).
• runTest gives more informative errors when it times out waiting for external completion (#3071).
• SendChannel.trySendBlocking is now available on Kotlin/Native (#3064).
• Fixed the bug due to which Dispatchers.Main was not used for delay and withTimeout (#3046).
• JDK 1.6 is no longer required for building the project (#3043).
• New version of Dokka is used, fixing the memory leak when building the coroutines and providing brand new reference visuals (https://kotlin.github.io/kotlinx.coroutines/) (#3051, #3054).