add JDK 17 to CI

SethTisue · SethTisue · commit 97c98544f171 · 2021-07-15T14:40:01.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -14,6 +14,7 @@ scala:
 env:
   - ADOPTOPENJDK=8
   - ADOPTOPENJDK=11
+  - ADOPTOPENJDK=17
 
 install:
   - git fetch --tags # get all tags for sbt-dynver
