[#14] Update neo-go to v0.91.0

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

go.mod

@@ -15,7 +15,7 @@ require (
 	github.com/multiformats/go-multiaddr-net v0.1.2 // v0.1.1 => v0.1.2
 	github.com/multiformats/go-multihash v0.0.13
 	github.com/nspcc-dev/hrw v1.0.9
-	github.com/nspcc-dev/neo-go v0.90.0
+	github.com/nspcc-dev/neo-go v0.91.0
 	github.com/nspcc-dev/neofs-api-go v1.3.1-0.20200821125006-afd2ce0400ec
 	github.com/nspcc-dev/neofs-crypto v0.3.0
 	github.com/nspcc-dev/netmap v1.7.0