phar compiler should also compile autoload_psr4.php

src/Composer/Compiler.php

@@ -103,6 +103,7 @@ class Compiler
 
         $this->addFile($phar, new \SplFileInfo(__DIR__.'/../../vendor/autoload.php'));
         $this->addFile($phar, new \SplFileInfo(__DIR__.'/../../vendor/composer/autoload_namespaces.php'));
+        $this->addFile($phar, new \SplFileInfo(__DIR__.'/../../vendor/composer/autoload_psr4.php'));
         $this->addFile($phar, new \SplFileInfo(__DIR__.'/../../vendor/composer/autoload_classmap.php'));
         $this->addFile($phar, new \SplFileInfo(__DIR__.'/../../vendor/composer/autoload_real.php'));
         if (file_exists(__DIR__.'/../../vendor/composer/include_paths.php')) {