replace go-merkledag with go-fetcher

.travis.yml

@@ -4,7 +4,7 @@ os:
 language: go
 
 go:
-  - 1.11.x
+  - 1.13.x
 
 env:
   global:

go.mod

@@ -1,23 +1,24 @@
 module github.com/ipfs/go-ipfs-provider
 
-go 1.12
+go 1.13
 
 require (
 	github.com/cenkalti/backoff v2.2.1+incompatible
-	github.com/ipfs/go-blockservice v0.1.2
-	github.com/ipfs/go-cid v0.0.3
+	github.com/ipfs/go-blockservice v0.1.4
+	github.com/ipfs/go-cid v0.0.7
 	github.com/ipfs/go-cidutil v0.0.2
-	github.com/ipfs/go-datastore v0.1.0
-	github.com/ipfs/go-ipfs-blockstore v0.1.0
+	github.com/ipfs/go-datastore v0.4.5
+	github.com/ipfs/go-fetcher v1.1.0
+	github.com/ipfs/go-ipfs-blockstore v0.1.4
 	github.com/ipfs/go-ipfs-blocksutil v0.0.1
 	github.com/ipfs/go-ipfs-exchange-offline v0.0.1
 	github.com/ipfs/go-ipfs-routing v0.1.0
 	github.com/ipfs/go-ipld-cbor v0.0.3
-	github.com/ipfs/go-ipld-format v0.0.2
-	github.com/ipfs/go-log v0.0.1
-	github.com/ipfs/go-merkledag v0.2.3
+	github.com/ipfs/go-log v1.0.4
 	github.com/ipfs/go-verifcid v0.0.1
-	github.com/libp2p/go-libp2p-core v0.2.2
-	github.com/libp2p/go-libp2p-testing v0.1.0
-	github.com/multiformats/go-multihash v0.0.8
+	github.com/ipld/go-codec-dagpb v1.2.0
+	github.com/ipld/go-ipld-prime v0.9.0
+	github.com/libp2p/go-libp2p-core v0.8.5
+	github.com/libp2p/go-libp2p-testing v0.4.0
+	github.com/multiformats/go-multihash v0.0.15
 )