Update Kotlin to 1.5.0 (#2674)

* Update Kotlin to 1.5.0
* Update atomicfu to 0.16.1

Co-authored-by: SokolovaMaria <maria.sokolova@jetbrains.com>

Author: qwwdfsad

README.md

@@ -3,11 +3,11 @@
 [![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://img.shields.io/maven-central/v/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.4.3)](https://search.maven.org/artifact/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.4.3/pom)
-[![Kotlin](https://img.shields.io/badge/kotlin-1.4.30-blue.svg?logo=kotlin)](http://kotlinlang.org)
+[![Kotlin](https://img.shields.io/badge/kotlin-1.5.0-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 the Kotlin `1.4.30` release.
+This is a companion version for the Kotlin `1.5.0` release.
 
 ```kotlin
 suspend fun main() = coroutineScope {

gradle.properties

@@ -5,12 +5,12 @@
 # Kotlin
 version=1.4.3-SNAPSHOT
 group=org.jetbrains.kotlinx
-kotlin_version=1.5.0-RC
+kotlin_version=1.5.0
 
 # Dependencies
 junit_version=4.12
 junit5_version=5.7.0
-atomicfu_version=0.15.2
+atomicfu_version=0.16.1
 knit_version=0.2.3
 html_version=0.7.2
 lincheck_version=2.12