travis: use openjdk8 as oraclejdk8 stopped working

vpriscan · vpriscan · commit 79efc4126ea8 · 2020-02-01T18:25:04.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: java
 
 jdk:
-  - oraclejdk8
+  - openjdk8
   
 sudo: false
 # as per http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/
