Change build to be Java 11

SmiddyPence · SmiddyPence · commit 4df8592ee2f4 · 2019-05-17T10:40:49.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,8 +3,7 @@ language: java
 install: mvn install -DskipTests=true
 script: mvn test
 jdk:
-  - oraclejdk8
-  - oraclejdk9
+  - openjdk11
 notifications:
   webhooks:
     urls:
