try xenial + OpenJDK 8

Vladimir Kotal · Vladimir Kotal · commit 7d6e88bf40a3 · 2019-06-17T14:07:43.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -24,9 +24,9 @@ jobs:
   - stage: test
     name: Linux + Oracle JDK 8
     os: linux
-    dist: trusty
+    dist: xenial
     sudo: required
-    jdk: oraclejdk8
+    jdk: openjdk8
     install: true
     script: dev/main
     before_install: dev/before_install
