lncli: add cancel invoice command

cmd/lncli/main.go

@@ -298,6 +298,7 @@ func main() {
 
 	// Add any extra autopilot commands determined by build flags.
 	app.Commands = append(app.Commands, autopilotCommands()...)
+	app.Commands = append(app.Commands, invoicesCommands()...)
 
 	if err := app.Run(os.Args); err != nil {
 		fatal(err)