update go-libp2p and viper dependencies

go.mod

@@ -6,22 +6,20 @@ require (
 	github.com/gogo/protobuf v1.3.1
 	github.com/gorilla/handlers v1.4.2
 	github.com/gorilla/mux v1.7.3
-	github.com/hashicorp/golang-lru v0.5.3 // indirect
-	github.com/ipfs/go-log v1.0.1 // indirect
-	github.com/libp2p/go-libp2p v0.5.0
+	github.com/libp2p/go-libp2p v0.5.1
 	github.com/libp2p/go-libp2p-autonat-svc v0.1.0
 	github.com/libp2p/go-libp2p-connmgr v0.2.1
 	github.com/libp2p/go-libp2p-core v0.3.0
 	github.com/libp2p/go-libp2p-quic-transport v0.2.2
 	github.com/libp2p/go-libp2p-secio v0.2.1
-	github.com/libp2p/go-libp2p-tls v0.1.2
+	github.com/libp2p/go-libp2p-tls v0.1.3
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/multiformats/go-multiaddr v0.2.0
 	github.com/multiformats/go-multistream v0.1.0
 	github.com/prometheus/client_golang v1.3.0
 	github.com/sirupsen/logrus v1.4.2
 	github.com/spf13/cobra v0.0.5
-	github.com/spf13/viper v1.6.1
+	github.com/spf13/viper v1.6.2
 	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
 	resenje.org/web v0.4.0
 )