safety fix

src/Router.php

@@ -75,7 +75,7 @@ class Router {
 
         foreach ($this->routes as $key => $value) {
             // Check if key contains a curly bracket, if not continue.  We already checked above.
-            if (!strpos($key, '{')) continue;
+            if (strpos($key, '{') === false) continue;
 
             // Remove everything after the curly bracket, from key
             $keyPath = substr($key, 0, strpos($key, '{'));