The highest tagged major version is v3.

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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

Redistributable licenses place minimal restrictions on how software can be used, modified, and redistributed.
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
p
go.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.
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.