Update Scala.js to 1.0.0-M6

Author: ashawley

.travis.yml

@@ -30,16 +30,16 @@ env:
     # The empty SCALAJS_VERSION will only compile for the JVM
     - SCALAJS_VERSION=
     - SCALAJS_VERSION=0.6.25
-    - SCALAJS_VERSION=1.0.0-M5
+    - SCALAJS_VERSION=1.0.0-M6
 
 matrix:
   exclude:
     - jdk: openjdk11
       env: SCALAJS_VERSION=0.6.25
     - jdk: openjdk11
-      env: SCALAJS_VERSION=1.0.0-M5
+      env: SCALAJS_VERSION=1.0.0-M6
     - scala: 2.11.12
-      env: SCALAJS_VERSION=1.0.0-M5
+      env: SCALAJS_VERSION=1.0.0-M6
     - scala: 2.11.12
       jdk: oraclejdk8
     - scala: 2.11.12

project/plugins.sbt

@@ -9,5 +9,5 @@ val scalaJSVersion =
   Option(System.getenv("SCALAJS_VERSION")).filter(_.nonEmpty).getOrElse("0.6.25")
 
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % scalaJSVersion)
-addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "0.5.0")
+addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "0.6.0")
 addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "1.0.14")