Fix Lumen routing for docs (fixes #365)

routes/lumen.php

@@ -10,7 +10,7 @@ $router = app()->router;
 $router->group([
     'middleware' => $middleware
 ], function () use ($router, $prefix) {
-    $router->get($prefix, ['uses' => [Controller::class, 'webpage'], 'as' => 'scribe']);
-    $router->get("$prefix.postman", ['uses' => [Controller::class, 'postman'], 'as' => 'scribe.postman']);
-    $router->get("$prefix.openapi", ['uses' => [Controller::class, 'openapi'], 'as' => 'scribe.openapi']);
+    $router->get($prefix, ['uses' => Controller::class.'@webpage', 'as' => 'scribe']);
+    $router->get("$prefix.postman", ['uses' => Controller::class.'@postman', 'as' => 'scribe.postman']);
+    $router->get("$prefix.openapi", ['uses' => Controller::class.'@openapi', 'as' => 'scribe.openapi']);
 });