Update sbt-scalajs-crossproject to 1.2.0

Author: 47erbot

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("com.github.sbt"       % "sbt-ci-release"           % "1.5.10")
-addSbtPlugin("org.portable-scala"   % "sbt-scalajs-crossproject" % "1.1.0")
+addSbtPlugin("org.portable-scala"   % "sbt-scalajs-crossproject" % "1.2.0")
 addSbtPlugin("org.scala-js"         % "sbt-scalajs"              % "1.9.0")
 addSbtPlugin("org.scalameta"        % "sbt-scalafmt"             % "2.4.6")
 addSbtPlugin("com.47deg"            % "sbt-microsites"           % "1.3.4")