Replace to openjdk11 on Travis CI

kazuki43zoo · kazuki43zoo · commit ae65b320c608 · 2019-06-29T14:21:01.000+09:00
Fixes gh-384
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: java
 
 jdk:
-  - oraclejdk11
+  - openjdk11
   - oraclejdk8
 
 after_success:
