Merge pull request #1572 from krmahadevan/krmahadevan-fix-1560

Update Travis for Java9

Author: cbeust

.travis.yml

@@ -24,11 +24,7 @@ matrix:
     - env: JDK=9
   include:
     - jdk: oraclejdk8
-    - jdk: oraclejdk8
-      addons:
-        apt:
-          packages:
-            - oracle-java9-installer
+    - jdk: oraclejdk9
       env: JDK=9
     - jdk: oraclejdk7
       dist: precise