Merge pull request #267 from scala-steward/update/sbt-scalajs-0.6.31

Update sbt-scalajs, scalajs-compiler to 0.6.31

Author: SethTisue

.travis.yml

@@ -7,10 +7,10 @@ scala:
 
 env:
   - SCALAJS_VERSION=         ADOPTOPENJDK=8
-  - SCALAJS_VERSION=0.6.29   ADOPTOPENJDK=8
+  - SCALAJS_VERSION=0.6.31   ADOPTOPENJDK=8
   - SCALAJS_VERSION=1.0.0-M8 ADOPTOPENJDK=8
   - SCALAJS_VERSION=         ADOPTOPENJDK=11
-  - SCALAJS_VERSION=0.6.29   ADOPTOPENJDK=11
+  - SCALAJS_VERSION=0.6.31   ADOPTOPENJDK=11
   - SCALAJS_VERSION=1.0.0-M8 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("0.6.29")
+  Option(System.getenv("SCALAJS_VERSION")).filter(_.nonEmpty).getOrElse("0.6.31")
 val scalaNativeVersion =
   Option(System.getenv("SCALANATIVE_VERSION")).filter(_.nonEmpty).getOrElse("0.3.9")