Update docummentation and default MINECRAFT_VERSION

Dockerfile

@@ -8,7 +8,7 @@
 
 FROM debian:jessie
 
-ENV MINECRAFT_VERSION 1.10.2
+ENV MINECRAFT_VERSION 1.11.2
 
 RUN echo "deb http://overviewer.org/debian ./" >> /etc/apt/sources.list && \
     apt-get update && \

README.md

@@ -11,7 +11,7 @@ The goal of this container is to easily run [Minecraft Overviewer](https://overv
 ```
 docker run \
   --rm \
-  -e MINECRAFT_VERSION=1.10 \
+  -e MINECRAFT_VERSION=1.11.2 \
   -v /home/user/minecraft/:/home/minecraft/server/:ro \
   -v /srv/http/minecraft/:/home/minecraft/render/:rw \
   mide/minecraft-overviewer:latest