Revert "Update sbt-scalajs to 0.6.32"

This reverts commit c0d5d6c.

Author: julienrf

.travis.yml

@@ -11,10 +11,10 @@ scala:
 
 env:
   - SCALAJS_VERSION=          ADOPTOPENJDK=8
-  - SCALAJS_VERSION=0.6.32    ADOPTOPENJDK=8
+  - SCALAJS_VERSION=0.6.31    ADOPTOPENJDK=8
   - SCALAJS_VERSION=1.0.0-RC2 ADOPTOPENJDK=8
   - SCALAJS_VERSION=          ADOPTOPENJDK=11
-  - SCALAJS_VERSION=0.6.32    ADOPTOPENJDK=11
+  - SCALAJS_VERSION=0.6.31    ADOPTOPENJDK=11
   - SCALAJS_VERSION=1.0.0-RC2 ADOPTOPENJDK=11
 
 matrix:

project/plugins.sbt

@@ -1,6 +1,6 @@
 val crossVer = "0.6.1"
 val scalaJSVersion =
-  Option(System.getenv("SCALAJS_VERSION")).filter(_.nonEmpty).getOrElse("0.6.32")
+  Option(System.getenv("SCALAJS_VERSION")).filter(_.nonEmpty).getOrElse("0.6.31")
 val scalaNativeVersion =
   Option(System.getenv("SCALANATIVE_VERSION")).filter(_.nonEmpty).getOrElse("0.3.9")