[travis] Only build with jdk8/11 from oracle

hazendaz · hazendaz · commit 840a38d89ad3 · 2018-12-22T20:28:00.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: java
 
 jdk:
-  - oraclejdk9
+  - oraclejdk11
   - oraclejdk8
 
 after_success:
