use a newer JDK on Travis

bsideup · bsideup · commit fd3a057daf70 · 2017-03-06T07:52:35.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,8 @@
 language: java
 jdk:
 - oraclejdk8
+dist: trusty
+addons:
+  apt:
+    packages:
+      - oracle-java8-installer
