mitchellh/packer — pull request #650 by pearkes (2013-11-22 10:33:28+00:00)
Title: readme: add a note about the gox dependency for compiling

I thought about putting it in `compile.sh` or `devcompile.sh`, but then
I realized if gox changes upstream it will be buried and potentially
confusing to update. Hence including the `-u` in the README for
`go get`.