The following issues were found in Gopkg.toml

I got an error when build using docker-compose

`$ docker-compose build`

```
The following issues were found in Gopkg.toml:

✗ unable to deduce repository and source type for "go.uber.org/zap": unable to read metadata: go-import metadata not found

ProjectRoot name validation failed
ERROR: Service 'burrow' failed to build: The command '/bin/sh -c cd $GOPATH/src/github.com/linkedin/Burrow && dep ensure && go build -o /tmp/burrow .' returned a non-zero code: 1
```

Any help would be appreciated

Start by reproducing the failure with `docker-compose build` and inspect `Gopkg.toml` around the `go.uber.org/zap` dependency. Trace the `dep ensure` and `go build` steps in the Docker build output, then confirm the project builds successfully without the reported metadata or ProjectRoot validation errors.

Written by the indexing model from the issue text.