Update Route.php

set flag 'u' out of $case_maters to avoid any problem when $case_maters set true

src/Steampixel/Route.php

@@ -83,7 +83,7 @@ class Route {
       $route['expression'] = $route['expression'].'$';
 
       // Check path match
-      if (preg_match('#'.$route['expression'].'#'.($case_matters ? '' : 'iu'), $path, $matches)) {
+      if (preg_match('#'.$route['expression'].'#'.($case_matters ? '' : 'i').'u', $path, $matches)) {
         $path_match_found = true;
 
         // Cast allowed method to array if it's not one already, then run through all methods