update go-bitswap

go.mod

 module github.com/ipfs/go-blockservice
 
 require (
-	github.com/gxed/pubsub v0.0.0-20180201040156-26ebdf44f824 // indirect
-	github.com/ipfs/go-bitswap v0.0.3
+	github.com/ipfs/go-bitswap v0.0.8
 	github.com/ipfs/go-block-format v0.0.2
-	github.com/ipfs/go-cid v0.0.1
-	github.com/ipfs/go-datastore v0.0.1
+	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
 	github.com/ipfs/go-ipfs-blocksutil v0.0.1
 	github.com/ipfs/go-ipfs-delay v0.0.1
@@ -15,4 +14,7 @@ require (
 	github.com/ipfs/go-ipfs-util v0.0.1
 	github.com/ipfs/go-log v0.0.1
 	github.com/ipfs/go-verifcid v0.0.1
+	github.com/libp2p/go-libp2p-interface-connmgr v0.1.0 // indirect
+	github.com/libp2p/go-libp2p-interface-pnet v0.1.0 // indirect
+	golang.org/x/sys v0.0.0-20190524152521-dbbf3f1254d4 // indirect
 )