Update异常处理

src/Autoloader/Psr4.php

@@ -457,7 +457,7 @@ class Psr4
     {
         $args = func_get_args();
         if (empty($args)) {
-            throw new InvalidParams("Param is null");
+            throw new InvalidParams("Parameter is null");
         }
         $class = array_shift($args);
         $className = $this->getClassName($class);