Add Scala-lang blog post link

Author: anatoliykmetyuk

docs/blog/_posts/2020-12-18-scala3-m3.md

@@ -13,6 +13,8 @@ During the weeks between M2 and M3, we have been tying up all the loose ends, so
 
 In this article, you will find the most important changes of this release compared to Scala 3.0.0-M2.
 
+To read more about all things that surround the Scala 3 release in the next months, check out the "[Scala 3 - Crossing the finish line](https://www.scala-lang.org/blog/2020/12/15/scala-3-crossing-the-finish-line.html)" blog post on scala-lang.org
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 # sbt plugin update
 We published a new version of the sbt plugin `sbt-dotty`, v0.5.0. Because of the changes in PR [#10607](https://github.com/lampepfl/dotty/pull/10607), this release of Scala 3 will not work with earlier versions of sbt-dotty. You will need to upgrade sbt-dotty to 0.5.0 to be able to use Scala 3.0.0-M3.