Enable go modules

[radeksimko]

Go modules are becoming a de-facto standard in the Go community and adding go.mod files with metadata helps projects which may consume this repository as a dependency in deciding how to pin transitive dependencies and how to resolve conflicts.

This is a result of the following commands:

go mod init
go get ./...
go mod tidy

in a clean Go 1.11.5 environment.

[mattn]

Thank you. I've better to merge #25 before this.

[radeksimko]

@mattn I'm happy to rebase & re-run the above commands for you after you merge that PR. Just ping me whenever you're ready. 😉

[coveralls]

Coverage remained the same at 100.0% when pulling 18d4608 on radeksimko:go-mod into 3fb116b on mattn:master.

[mattn]

Merged #25 go-isatty is already depend on x/sys. So can I merge this without rebase?

[radeksimko]

@mattn Ah, sure, I didn't realize that. It's safe to merge as is then! 😄

[mattn]

Thanks!

[radeksimko]

Thanks for a quick review & merge @mattn

It would be great if you could cut v0.0.5 with this patch as Go Modules strictly follow semantic versioning and the new version (with this patch) otherwise isn't discoverable via go get -u and other ways.

[mattn]

Tagged. Thanks.