try java 11 [skip ci]

mbdevpl · mbdevpl · commit 4cbf90dc90ce · 2019-04-05T02:55:44.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -28,7 +28,7 @@ matrix:
       sudo: true
       language: python
       python: "3.7"
-      env: TRAVIS_JDK_VERSION=oraclejdk10
+      env: TRAVIS_JDK_VERSION=openjdk11
     - os: osx
       language: generic
       env:
