chore(gomod): tidy go mod

Remove unneeded old dependencies

go.mod

@@ -4,13 +4,11 @@ go 1.12
 
 require (
 	github.com/btcsuite/btcd v0.0.0-20190629003639-c26ffa870fd8 // indirect
-	github.com/dgraph-io/badger v2.0.0-rc.2+incompatible // indirect
 	github.com/gogo/protobuf v1.2.1
 	github.com/golang/protobuf v1.3.2 // indirect
 	github.com/ipfs/go-block-format v0.0.2
 	github.com/ipfs/go-cid v0.0.3
 	github.com/ipfs/go-datastore v0.0.5
-	github.com/ipfs/go-ipfs v0.4.21 // indirect
 	github.com/ipfs/go-ipfs-blockstore v0.0.1
 	github.com/ipfs/go-ipfs-blocksutil v0.0.1
 	github.com/ipfs/go-log v0.0.1
@@ -20,18 +18,16 @@ require (
 	github.com/libp2p/go-eventbus v0.0.3 // indirect
 	github.com/libp2p/go-libp2p v0.2.1
 	github.com/libp2p/go-libp2p-core v0.0.9
-	github.com/libp2p/go-libp2p-net v0.1.0 // indirect
 	github.com/libp2p/go-libp2p-secio v0.1.1 // indirect
-	github.com/libp2p/go-libp2p-transport v0.0.5 // indirect
 	github.com/libp2p/go-msgio v0.0.4 // indirect
 	github.com/mattn/go-colorable v0.1.2 // indirect
 	github.com/multiformats/go-multiaddr v0.0.4
 	github.com/multiformats/go-multiaddr-dns v0.0.3 // indirect
 	github.com/multiformats/go-multihash v0.0.6
+	github.com/opentracing/opentracing-go v1.1.0 // indirect
 	github.com/smartystreets/goconvey v0.0.0-20190710185942-9d28bd7c0945 // indirect
 	go.opencensus.io v0.22.0 // indirect
 	golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 // indirect
 	golang.org/x/net v0.0.0-20190724013045-ca1201d0de80 // indirect
 	golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e // indirect
-	golang.org/x/tools v0.0.0-20190726230722-1bd56024c620 // indirect
 )