Add OpenJDK 12 to Travis builds.

Gary Gregory · Gary Gregory · commit a6ecad93bd69 · 2019-04-16T09:14:09.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -20,6 +20,7 @@ jdk:
   - oraclejdk11
   - openjdk8
   - openjdk11
+  - openjdk12
   - openjdk-ea
 
 after_success:
