Latest tagged version requires a bad grpc module version

[dmitshur]

The current latest version of the github.com/openzipkin/zipkin-go module is v0.1.5. Its go.mod file requires the module google.golang.org/grpc at version v1.16.0:

https://github.com/openzipkin/zipkin-go/blob/v0.1.5/go.mod#L27

That version is old, and has an issue where it requires the module golang.org/x/lint twice:

https://github.com/grpc/grpc-go/blob/v1.16.0/go.mod#L7
https://github.com/grpc/grpc-go/blob/v1.16.0/go.mod#L11

The first time it's being required via the module path github.com/golang/lint, which is not compatible with the module path specified in the latest master commit of that repository:

https://github.com/golang/lint/blob/5b3e6a55c961c61f4836ae6868c17b070744c590/go.mod#L1

As a result, when in module mode, doing go get -u github.com/openzipkin/zipkin-go fails:

$ cd $(mktemp -d)
$ export GO111MODULE=on
$ go get -u github.com/openzipkin/zipkin-go
go: finding github.com/golang/snappy v0.0.1
go: finding github.com/Shopify/sarama v1.21.0
go: github.com/golang/[email protected]: parsing go.mod: unexpected module path "golang.org/x/lint"
go get: error loading module requirements

Because this affects the latest version of this module, which is being required by other modules, it indirectly causes the issue golang/lint#436.

To fix this problem, you need to update go.mod to require a newer version of the grpc module and issue a new version. I can send a PR for the go.mod file change.

[dmitshur]

I can send a PR for the go.mod file change.

I've sent PR #115 that'll fix this issue (after it's merged and a new tag is created). /cc @basvanbeek @jcchavezs

[dmitshur]

I've reopened this as #117 because a new tag still needs to be made.