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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
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.
davecgh
go-spew/spew Package spew implements a deep pretty printer for Go data structures to aid in debugging.	Package spew implements a deep pretty printer for Go data structures to aid in debugging.
pmezard
go-difflib/difflib Package difflib is a partial port of Python difflib module.	Package difflib is a partial port of Python difflib module.
stretchr
testify/assert Package assert provides a set of comprehensive testing tools for use with the normal Go testing system.	Package assert provides a set of comprehensive testing tools for use with the normal Go testing system.