DockerHub, 2.2 release

[bw1235]

Minor nitpick, but while minimworld/minimserver:latest pulls 2.2, there's no tagged release yet for 2.2 or the 2.2 Arm release as indicated in the instructions:

Code:

To download the official MinimServer image for Intel, run this command:
docker pull minimworld/minimserver:2.2
For the ARM 32-bit version of the image, use this command instead:
docker pull minimworld/minimserver:2.2-arm

Thanks for a great new release!