https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md

2.2
https://kotlinlang.org/docs/whatsnew2220.html
2.1
https://kotlinlang.org/docs/compatibility-guide-21.html
2.0
https://kotlinlang.org/docs/compatibility-guide-20.html

1.9
Otus - Kotlin 1.9-2.2 for JVM 0:00 of 1:35:39
    https://www.youtube.com/watch?v=qzw9G0fhZNU
1.5
https://blog.jetbrains.com/kotlin/2021/05/kotlin-1-5-0-released/

1.4
https://blog.jetbrains.com/kotlin/2019/12/what-to-expect-in-kotlin-1-4-and-beyond/

1.3
https://blog.jetbrains.com/kotlin/2020/03/kotlin-1-3-70-released/
https://blog.jetbrains.com/kotlin/2019/08/kotlin-1-3-50-released/
https://blog.jetbrains.com/kotlin/2019/06/kotlin-1-3-40-released/
https://blog.jetbrains.com/kotlin/2019/04/kotlin-1-3-30-released/
    https://www.infoq.com/news/2019/04/kotlin-1.3.30
https://blog.jetbrains.com/kotlin/2019/01/kotlin-1-3-20-released
https://blog.jetbrains.com/kotlin/2018/10/kotlin-1-3/
    https://habr.com/company/JetBrains/blog/428291/
https://www.infoq.com/news/2018/10/kotlin-1.3-rc
https://blog.jetbrains.com/kotlin/2018/09/kotlin-1-3-rc-is-here-migrate-your-coroutines/
https://blog.jetbrains.com/kotlin/2018/08/kotlin-1-3-m2/
https://blog.jetbrains.com/kotlin/2018/07/see-whats-coming-in-kotlin-1-3-m1/
https://habrahabr.ru/company/redmadrobot/blog/351516/
    https://www.youtube.com/watch?v=gwk4rdgr36E

1.2
https://blog.jetbrains.com/kotlin/2018/08/kotlin-1-2-60-is-out/
https://blog.jetbrains.com/kotlin/2018/06/kotlin-1-2-50-is-out/
https://blog.jetbrains.com/kotlin/2018/04/kotlin-1-2-40-is-out/
https://www.infoq.com/news/2018/03/jetbrains-releases-kotlin-1.2.30
https://blog.jetbrains.com/kotlin/2018/03/kotlin-1-2-30-is-out/
http://kotlinlang.org/docs/reference/whatsnew12.html
https://blog.jetbrains.com/kotlin/2017/11/kotlin-1-2-released/
https://blog.jetbrains.com/kotlin/2017/09/kotlin-1-2-beta-is-out/

1.1.3
https://blog.jetbrains.com/kotlin/2017/06/kotlin-1-1-3-is-out/
https://github.com/JetBrains/kotlin/blob/1.1.3/ChangeLog.md

1.1
https://blog.jetbrains.com/kotlin/2017/03/kotlin-1-1/
http://kotlinlang.org/docs/reference/whatsnew11.html

https://habrahabr.ru/company/JetBrains/blog/323012/
https://spring.io/blog/2017/01/04/introducing-kotlin-support-in-spring-framework-5-0