我如何找到go包的版本

I'm using dep and I want to add new dependencies in the Gopkg.toml file but I don't how to find the correct version.

I see that someone already added a dependency to fatih/color from github and specified version 1.5.0. How was this value found?

For example I'm adding a dependency on pkg/errors, what is it's current version?

I'm an idiot, missed the releases link...