Hard code version to 1.2.0

Author: armanbilge

build.sbt

@@ -22,6 +22,7 @@ lazy val root = project
 
 name := "Scala.js DOM"
 
+ThisBuild / version := "1.2.0"
 ThisBuild / crossScalaVersions := {
   if (scalaJSVersion.startsWith("1.")) Seq("2.12.10", "2.11.12", "2.13.1")
   else Seq("2.12.10", "2.11.12", "2.10.7", "2.13.1")