Merge pull request #94 from SethTisue/jdk17

Author: SethTisue

.travis.yml

@@ -5,13 +5,15 @@ import: scala/scala-dev:travis/default.yml
 language: scala
 
 scala:
-  - 2.13.4
+  - 2.13.6
 
 env:
   - SCALAJS_BUILD=     ADOPTOPENJDK=8
   - SCALAJS_BUILD=     ADOPTOPENJDK=11
+  - SCALAJS_BUILD=     ADOPTOPENJDK=17
   - SCALAJS_BUILD=true ADOPTOPENJDK=8
   - SCALAJS_BUILD=true ADOPTOPENJDK=11
+  - SCALAJS_BUILD=true ADOPTOPENJDK=17
 
 install:
   - git fetch --tags # get all tags for sbt-dynver