Go Module Support

[alee792]

Go Modules don't officially land until Go 1.13, but it would be helpful to preemptively support it.

There is currently an issue when attempting to use SOPS/decrypt due to a dependency with contrib.go.opencensus.io/exporter/ocagent. The go toolchain will pull the most recent release, v0.4.8, but actually requires v0.4.5.

Locking the dependency in a go.mod to contrib.go.opencensus.io/exporter/ocagent v0.4.5 // indirect solves this problem.

To be fair, this is an issue with Azure's package. However, it's a good opportunity to make the package work right out of the box.

[tariq1890]

+1 @autrilla @jvehent Your thoughts please.

[autrilla]

I don't have time (and I imagine Julien has even less 😉 ) to implement this but as long as it doesn't break existing users, it'd be great to have this.

[tariq1890]

I can try taking some time out for this. I couldn't quite gather what sops is currently using for dependency management right now.

[autrilla]

It uses govend

[davidovich]

Note that adopting modules require to have tags in this specific semver format: v3.3.1, which the sops project does not use currently.

[davidovich]

see also #540

[davidovich]

I think this can be closed by #566