Upgrade Go to 1.8.1
* [blog post](https://blog.golang.org/go1.8) * [release notes](https://golang.org/doc/go1.8) * [minor release notes](https://golang.org/doc/devel/release.html#go1.8.minor) Note: > Go 1.8 now only supports OS X 10.8 or later. This is likely the last Go release to support 10.8. Compiling Go or running binaries on older OS X versions is untested. See also legacy/trac#21709 for Go 1.7.5. I'm going to test a 1.7.5 patch before working on 1.8.
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