Use openJDK instead of OracleJDK


git-svn-id: https://svn.apache.org/repos/asf/creadur/tentacles/trunk@1860678 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/.travis.yml b/.travis.yml
index b580037..203a2c1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: java
 jdk:
-  - oraclejdk8
+  - openjdk8
 #before_script:
 #  - pip install --user codecov