build: update to latest version of neutrino

This new version of neutrino includes a number of fixes to the query
functionality of neutrino, stuck syncing issues, and peer connection
handling and banning.

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/btcsuite/btcd v0.0.0-20190410025418-9bfb2ca0346b
 	github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f
 	github.com/btcsuite/btcutil v0.0.0-20190316010144-3ac1210f4b38
-	github.com/btcsuite/btcwallet v0.0.0-20190327034548-8b90263a6190
+	github.com/btcsuite/btcwallet v0.0.0-20190419031546-9e694e2bfc91
 	github.com/btcsuite/fastsha256 v0.0.0-20160815193821-637e65642941
 	github.com/coreos/bbolt v1.3.2
 	github.com/davecgh/go-spew v1.1.1
@@ -28,7 +28,7 @@ require (
 	github.com/juju/utils v0.0.0-20180820210520-bf9cc5bdd62d // indirect
 	github.com/juju/version v0.0.0-20180108022336-b64dbd566305 // indirect
 	github.com/kkdai/bstream v0.0.0-20181106074824-b3251f7901ec
-	github.com/lightninglabs/neutrino v0.0.0-20190321023416-6dac90b98052
+	github.com/lightninglabs/neutrino v0.0.0-20190419021618-2e9d0617aa96
 	github.com/lightningnetwork/lightning-onion v0.0.0-20180605012408-ac4d9da8f1d6
 	github.com/lightningnetwork/lnd/queue v1.0.1
 	github.com/lightningnetwork/lnd/ticker v1.0.0