Kotlin and Slack channel shields (#2205)

README.md

@@ -3,6 +3,8 @@
 [![official JetBrains project](https://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
 [![GitHub license](https://img.shields.io/badge/license-Apache%20License%202.0-blue.svg?style=flat)](https://www.apache.org/licenses/LICENSE-2.0)
 [![Download](https://api.bintray.com/packages/kotlin/kotlinx/kotlinx.coroutines/images/download.svg?version=1.3.9) ](https://bintray.com/kotlin/kotlinx/kotlinx.coroutines/1.3.9)
+[![Kotlin](https://img.shields.io/badge/kotlin-1.4.0-blue.svg?logo=kotlin)](http://kotlinlang.org)
+[![Slack channel](https://img.shields.io/badge/chat-slack-green.svg?logo=slack)](https://kotlinlang.slack.com/messages/coroutines/)
 
 Library support for Kotlin coroutines with [multiplatform](#multiplatform) support.
 This is a companion version for Kotlin `1.4.0` release.