can't build s390x docker images; skip for now (fullstorydev#265)

fix release script: 'docker buildx create' step needs to be re-runnab…

…le without error (fullstorydev#264)

invoking client-streaming RPC can panic (fullstorydev#262)

Upgrade to using golang 1.15 to build (fullstorydev#240)

make go.sum authoritative

darwin/386... 🤦

make release work... (fullstorydev#179)

Bump grpc-go to 1.30.0 (fullstorydev#168)

* Bump grpc-go to 1.30.0
* Import new xds package instead of experimental

Co-authored-by: Erik Johansson <[email protected]>

use go 1.13 to build docker image (fullstorydev#160)

Remove golang/protobuf/jsonpbtest dep (fullstorydev#145)

With 1.4.0 the golang/protobuf json testing protofiles
are being moved to [an internal package][1]. While this is
technically a breaking change, I doubt the maintainers
are going to reintroduce it, so I've copied the necessary
parts to our own testing protofile.

This allows users of this package and, more importantly,
grpcui to try 1.4.0 without this package having to migrate yet.
When it comes to migrating to 1.4.0, this should also make the
transition easier.

[1]: https://github.com/golang/protobuf/tree/v1.4.0-rc.4/internal/testprotos