The highest tagged major version is v3.

src/

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Valid go.mod file

The Go module system was introduced in Go 1.11 and is the official dependency management solution for Go.
Redistributable license

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Tagged version

Modules with tagged versions give importers more predictable builds.
Stable version

When a project reaches major version v1 it is considered stable.
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Path	Synopsis
code.google.com
p/gogoprotobuf/proto Package proto converts data structures to and from the wire format of protocol buffers.	Package proto converts data structures to and from the wire format of protocol buffers.
github.com
codegangsta/cli Package cli provides a minimal framework for creating and organizing command line Go applications.	Package cli provides a minimal framework for creating and organizing command line Go applications.
coreos/go-etcd/etcd
jonboulle/clockwork
stretchr/testify/assert
golang.org
x/net/context Package context defines the Context type, which carries deadlines, cancelation signals, and other request-scoped values across API boundaries and between processes.	Package context defines the Context type, which carries deadlines, cancelation signals, and other request-scoped values across API boundaries and between processes.