Update to openjdk8
diff --git a/.travis.yml b/.travis.yml
index f90d535..d8f3a6b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: groovy
 sudo: false
 jdk:
-  - oraclejdk8
+  - openjdk8
 services:
   - redis-server
 before_script: