Updated Forge usage docs and set FORGEVERSION=RECOMMENDED by default

minecraft-server/Dockerfile

@@ -31,4 +31,4 @@ ENV MC_IMAGE=YES
 ENV UID=1000
 ENV MOTD A Minecraft Server Powered by Docker
 ENV JVM_OPTS -Xmx1024M -Xms1024M
-ENV TYPE=VANILLA VERSION=LATEST LEVEL=world PVP=true DIFFICULTY=easy
+ENV TYPE=VANILLA VERSION=LATEST FORGEVERSION=RECOMMENDED LEVEL=world PVP=true DIFFICULTY=easy

minecraft-server/README.md

@@ -96,11 +96,12 @@ or a specific version:
 
 ## Running a Forge Server
 
-By default the container will run the selected "vanilla" (aka official) Minecraft server, but
+Enable Forge server mode by adding a `-e TYPE=FORGE` to your command-line.
-you can also choose to run the `LATEST` or a specific version of a [Forge server](http://www.minecraftforge.net/wiki/).
+By default the container will run the `RECOMMENDED` version of [Forge server](http://www.minecraftforge.net/wiki/)
-Enable Forge server mode by adding a `-e TYPE=FORGE` to your command-line, such as
+but you can also choose to run a specific version with `-e FORGEVERSION=10.13.4.1448`.
 
-    $ docker run -d -v /path/on/host:/data -e TYPE=FORGE -e VERSION=1.7.10 \
+    $ docker run -d -v /path/on/host:/data -e VERSION=1.7.10 \
+        -e TYPE=FORGE -e FORGEVERSION=10.13.4.1448 \
         -p 25565:25565 -e EULA=TRUE itzg/minecraft
 
 In order to add mods, you will need to attach the container's `/data` directory