Switch to openjdk7

Ron · web-flow · commit fed70942b069 · 2017-10-17T09:22:43.000-07:00
Due to travis-ci/travis-ci#8455.
diff --git a/.travis.yml b/.travis.yml
@@ -2,4 +2,4 @@ sudo: false
 language: java
 script: mvn verify
 jdk:
-  - oraclejdk7
+  - openjdk7
