Help go-ipfs release 0.4.12!

[victorb]

go-ipfs is currently in the middle of doing a release candidate. This means we'd love for you to test as much as possible, and report any issues so we can fix them before doing a stable release.

You can download it from here: https://dist.ipfs.io/go-ipfs/v0.4.12-rc1

Or if you're using go-ipfs from source, do a git checkout from v0.4.12-rc1

Changelog: https://github.com/ipfs/go-ipfs/blob/master/CHANGELOG.md#0412-rc1-2017-10-26