Update deps (go-ipfs is not necessary)

go.mod

@@ -3,20 +3,21 @@ module github.com/ipfs/go-ipfs-provider
 go 1.12
 
 require (
+	github.com/btcsuite/btcd v0.0.0-20190605094302-a0d1e3e36d50 // indirect
 	github.com/cenkalti/backoff v2.1.1+incompatible
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/ipfs/go-block-format v0.0.2
 	github.com/ipfs/go-cid v0.0.2
-	github.com/ipfs/go-cidutil v0.0.2
 	github.com/ipfs/go-datastore v0.0.5
-	github.com/ipfs/go-ipfs v0.4.21
 	github.com/ipfs/go-ipfs-blockstore v0.0.1
 	github.com/ipfs/go-ipfs-blocksutil v0.0.1
 	github.com/ipfs/go-ipfs-routing v0.1.0
-	github.com/ipfs/go-ipld-format v0.0.2
 	github.com/ipfs/go-log v0.0.1
-	github.com/ipfs/go-merkledag v0.1.0
 	github.com/ipfs/go-verifcid v0.0.1
 	github.com/libp2p/go-libp2p-core v0.0.3
 	github.com/libp2p/go-libp2p-testing v0.0.4
-	google.golang.org/appengine v1.4.0 // indirect
+	github.com/mattn/go-colorable v0.1.2 // indirect
+	github.com/opentracing/opentracing-go v1.1.0 // indirect
+	golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8 // indirect
+	golang.org/x/sys v0.0.0-20190610200419-93c9922d18ae // indirect
 )