add openjdk to travis (#3300)

lovepoem · zonghaishang · commit bf3b423dc563 · 2019-03-12T20:44:54.000+08:00
* add openjdk to travis

* add openjdk to travis
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,9 @@ language: java
 sudo: false # faster builds
 
 jdk:
+  - openjdk11
   - oraclejdk11
+  - openjdk8
   - oraclejdk8
 
 cache:
