[travis] replace oraclejdk7 with openjdk8

hazendaz · hazendaz · commit a08aa135a6d7 · 2017-09-23T20:02:43.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ sudo: false
 
 jdk:
   - oraclejdk8
-  - oraclejdk7
+  - openjdk8
   - openjdk7
 
 after_success:
