Use openjdk for travis checks
diff --git a/.travis.yml b/.travis.yml
index b0759c9..3889d95 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@
 language: java
 
 jdk:
-  - oraclejdk8
+  - openjdk8
 
 before_cache:
   - rm -f $HOME/.gradle/caches/modules-2/modules-2.lock