Merge pull request #47 from olleolleolle/a-copyright-year-update

(doc) Copyright year set to 2020 in footer
diff --git a/.travis.yml b/.travis.yml
index 66ba408..ac80650 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: ruby
 jdk:
-  - oraclejdk8
+  - openjdk8
 rvm:
   - 2.3.1
   - jruby-1.7.27