Update docker image to ubuntu:18.04

- Update java to jre11, worked in local tests

Dockerfile

@@ -1,6 +1,6 @@
-FROM ubuntu:16.04
+FROM ubuntu:18.04
 MAINTAINER Marcel Otte <qwc+docker@mmo.to>
-RUN apt-get update && apt-get install -y openjdk-8-jre wget unzip
+RUN apt-get update && apt-get install -y openjdk-11-jre wget unzip
 RUN mkdir /terasology \
     && wget -P /terasology http://jenkins.terasology.org/job/DistroOmegaRelease/lastSuccessfulBuild/artifact/distros/omega/build/distributions/TerasologyOmega.zip \
     && unzip /terasology/TerasologyOmega.zip -d /terasology \

docker-compose.yml

@@ -1,6 +1,8 @@
+version: '2'
+services:
     terasology:
       image: qwick/terasology:latest
       ports:
         - 25777:25777
       volumes:
-    - /mnt/data/docker/terasology:/terasology/server
+        - ./terasology:/terasology/server