try to change to maven box

Vladimir Kotal · Vladimir Kotal · commit 4d5614c97bf0 · 2018-11-02T11:15:17.000+01:00
diff --git a/wercker.yml b/wercker.yml
@@ -1,6 +1,4 @@
-# This references an OpenJDK container from the
-# Docker Hub https://hub.docker.com/_/openjdk/
-box: openjdk:8-jdk
+box: maven:3.5.3-jdk-8
 
 # This should switch to Oracle JDK however does not work:
 #box:
