travis: fix unsupported jdk

.travis.yml

@@ -8,7 +8,7 @@ branches:
 
 matrix:
   include:
-  - jdk: openjdk8
+  - jdk: oraclejdk8
     os: linux
     env: UPLOAD_ALL=true
   - jdk: openjdk7
@@ -24,10 +24,6 @@ cache:
     - $HOME/.gradle/caches/
     - $HOME/.gradle/wrapper/
 
-before_script:
-  - 'echo "Tag: $TRAVIS_TAG"'
-  - 'echo "OS: $TRAVIS_OS_NAME"'
-  - 'echo "PR: $TRAVIS_PULL_REQUEST"'
 
 notifications:
   slack: