Make `make tidy` skip `*.pb.go` files
Make `make tidy` skip `*.pb.go` files

Previously, `make tidy` included protobuf based automatically generated
go codes. This threw errors because protobuf style does not conform to go
style.

ohsu-comp-bio/funnel,ohsu-comp-bio/funnel,adamstruck/funnel,adamstruck/funnel,ohsu-comp-bio/funnel,adamstruck/funnel,buchanae/funnel,buchanae/funnel,buchanae/funnel,adamstruck/funnel,buchanae/funnel,ohsu-comp-bio/funnel