Don't ignore vendor .pb.go

.gitignore

vendor/github.com/gogo/protobuf/gogoproto/gogo.pb.go

...gogo/protobuf/protoc-gen-gogo/descriptor/descriptor.pb.go

vendor/github.com/gogo/protobuf/types/any.pb.go

vendor/github.com/gogo/protobuf/types/duration.pb.go

vendor/github.com/gogo/protobuf/types/empty.pb.go

vendor/github.com/gogo/protobuf/types/field_mask.pb.go

vendor/github.com/gogo/protobuf/types/struct.pb.go

vendor/github.com/gogo/protobuf/types/timestamp.pb.go

vendor/github.com/gogo/protobuf/types/wrappers.pb.go

vendor/github.com/golang/protobuf/ptypes/any/any.pb.go

...github.com/golang/protobuf/ptypes/duration/duration.pb.go

vendor/github.com/golang/protobuf/ptypes/empty/empty.pb.go

...thub.com/golang/protobuf/ptypes/timestamp/timestamp.pb.go

...thub.com/openzipkin/zipkin-go-opentracing/wire/wire.pb.go

vendor/github.com/prometheus/client_model/go/metrics.pb.go

vendor/github.com/weaveworks/common/httpgrpc/httpgrpc.pb.go

vendor/github.com/weaveworks/common/server/fake_server.pb.go

...le.golang.org/genproto/googleapis/rpc/status/status.pb.go

...golang.org/grpc/grpclb/grpc_lb_v1/messages/messages.pb.go