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`.
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@ -77,6 +77,13 @@ For some additional dependencies, Go needs [Mercurial](http://mercurial.selenic.
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to be installed. Packer itself doesn't require this but a dependency of a
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dependency does.
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You'll also need [`gox`](https://github.com/mitchellh/packer)
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to compile packer. You can install that with:
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```
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$ go get -u github.com/mitchellh/gox
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```
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Next, clone this repository into `$GOPATH/src/github.com/mitchellh/packer` and
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then just type `make`. In a few moments, you'll have a working `packer` executable:
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