fix mods

go.mod

@@ -9,10 +9,7 @@ require (
 	github.com/multiformats/go-multihash v0.0.14 // indirect
 	github.com/multiformats/go-varint v0.0.6 // indirect
 	github.com/polydawn/refmt v0.0.0-20190807091052-3d65705ee9f1
-	github.com/rvagg/go-dagpb/pb v0.0.0-00010101000000-000000000000
 	golang.org/x/crypto v0.0.0-20201203163018-be400aefbc4c // indirect
 	golang.org/x/sys v0.0.0-20201207223542-d4d67f95c62d // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
 )
-
-replace github.com/rvagg/go-dagpb/pb => ./pb