Upgrade to openjdk11

bnasslahsen · web-flow · commit 837e05314db3 · 2021-02-24T12:08:55.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: java
 jdk:
-  - openjdk8
+  - openjdk11
 cache:
   directories:
     - $HOME/.m2
