dep: fixup go.sum

go.mod

@@ -3,7 +3,7 @@ module github.com/ipfs/go-merkledag
 require (
 	github.com/gogo/protobuf v1.2.1
 	github.com/ipfs/go-block-format v0.0.2
-	github.com/ipfs/go-blockservice v0.0.7
+	github.com/ipfs/go-blockservice v0.1.0
 	github.com/ipfs/go-cid v0.0.2
 	github.com/ipfs/go-datastore v0.0.5
 	github.com/ipfs/go-ipfs-blockstore v0.0.1