use latest jdk version in travis

Vasile Baluta · Vasile Baluta · commit 2e1ae16b0d4c · 2018-04-18T13:51:12.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,8 @@
 sudo: required
+addons:
+  apt:
+    packages:
+      - oracle-java8-installer
 
 language: java
 
