Bump golangci-lint and AppVeyor versions now that 1.13.x is supported (#375)

exchanges/websocket/wshandler/wshandler.go

@@ -40,7 +40,6 @@ func (w *Websocket) Setup(connector func() error,
 	defaultURL,
 	runningURL string,
 	authenticatedWebsocketAPISupport bool) error {
-
 	w.DataHandler = make(chan interface{}, 1)
 	w.Connected = make(chan struct{}, 1)
 	w.Disconnected = make(chan struct{}, 1)

exchanges/websocket/wsorderbook/wsorderbook_test.go

@@ -434,7 +434,6 @@ func TestFlushCache(t *testing.T) {
 	if obl.ob[curr][spot] != nil {
 		t.Error("expected ob be flushed")
 	}
-
 }
 
 // TestInsertingSnapShots logic test