`kotlinx.coroutines` version 0.13 is published wit...

# coroutines

[elizarov]

kotlinx.coroutines version 0.13 is published with quite a lot of changes, cleanup, and a few new nice features, including Android UI module. Documentation is significantly expanded with two new guides on UI programming and a guide on reactive streams. The full list of changes is here: https://github.com/Kotlin/kotlinx.coroutines/blob/master/CHANGES.md