remove oraclejdk7 test

xuwei-k · web-flow · commit 8dce150094dd · 2017-10-22T17:50:27.000+09:00
travis-ci no longer support oraclejdk7 - travis-ci/travis-ci#7884 (comment) - http://www.webupd8.org/2017/06/why-oracle-java-7-and-6-installers-no.html
diff --git a/.travis.yml b/.travis.yml
@@ -10,7 +10,6 @@ sudo: false
 
 jdk:
   - openjdk7
-  - oraclejdk7
   - oraclejdk8
 
 branches:
