remove jdk 8 dependency

Author: iluwatar

.travis.yml

@@ -8,20 +8,13 @@ env:
 language: ruby
 rvm:
   - 2.2.0
-jdk:
-- oraclejdk8
 
 before_install:
     - sudo apt-get update
     - sudo apt-get install -y curl libcurl4-openssl-dev
 
 install: bundle install --jobs=3 --retry=3
 
-addons:
-  apt:
-    packages:
-      - oracle-java8-installer
-      
 script: bash cibuild.sh || true
 after_script: travis_retry bundle exec s3_website push