Add java8 to travis.
diff --git a/.travis.yml b/.travis.yml
index 14a9e64..d9dfb24 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: java
 
 jdk:
+  - oraclejdk8
   - oraclejdk7
   - openjdk7
   - openjdk6