Update go-libp2p version to v0.20.3

go.mod

@@ -5,23 +5,19 @@ go 1.13
 require (
 	github.com/hashicorp/golang-lru v0.5.5-0.20210104140557-80c98217689d
 	github.com/iotexproject/go-pkgs v0.1.12
-	github.com/ipfs/go-cid v0.0.7
-	github.com/libp2p/go-libp2p v0.14.3
-	github.com/libp2p/go-libp2p-circuit v0.4.0
+	github.com/ipfs/go-cid v0.2.0
+	github.com/libp2p/go-libp2p v0.20.3
 	github.com/libp2p/go-libp2p-connmgr v0.2.4
-	github.com/libp2p/go-libp2p-core v0.8.5
-	github.com/libp2p/go-libp2p-discovery v0.5.0
-	github.com/libp2p/go-libp2p-kad-dht v0.11.1
-	github.com/libp2p/go-libp2p-pubsub v0.4.1
-	github.com/libp2p/go-libp2p-secio v0.2.2
-	github.com/libp2p/go-libp2p-transport-upgrader v0.4.2
-	github.com/libp2p/go-libp2p-yamux v0.5.4
-	github.com/libp2p/go-tcp-transport v0.2.3
-	github.com/multiformats/go-multiaddr v0.3.3
-	github.com/multiformats/go-multihash v0.0.15
+	github.com/libp2p/go-libp2p-core v0.16.1
+	github.com/libp2p/go-libp2p-discovery v0.6.0
+	github.com/libp2p/go-libp2p-kad-dht v0.16.0
+	github.com/libp2p/go-libp2p-pubsub v0.7.1
+	github.com/libp2p/go-libp2p-yamux v0.8.2
+	github.com/multiformats/go-multiaddr v0.5.0
+	github.com/multiformats/go-multihash v0.1.0
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.10.0
-	github.com/stretchr/testify v1.7.0
-	go.uber.org/zap v1.16.0
+	github.com/prometheus/client_golang v1.12.1
+	github.com/stretchr/testify v1.7.1
+	go.uber.org/zap v1.21.0
 	golang.org/x/time v0.0.0-20201208040808-7e3f01d25324
 )