expose internal/pb packages.

we shouldn't use internal packages.

License: MIT
Signed-off-by: Juan Batiz-Benet <juan@benet.ai>

coding.go

@@ -6,7 +6,7 @@ import (
 
 	mh "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-multihash"
 
-	pb "github.com/ipfs/go-ipfs/merkledag/internal/pb"
+	pb "github.com/ipfs/go-ipfs/merkledag/pb"
 	u "github.com/ipfs/go-ipfs/util"
 )