minor #206 fix deprecated syntax in installRequirementsFile (xaben)

This PR was merged into the 3.0.x-dev branch.

Discussion
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fix deprecated syntax in installRequirementsFile

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #205
| License       | MIT
| Doc PR        | n/a

fix for #205

Commits
-------

9021205 fix deprecated syntax in installRequirementsFile

Composer/ScriptHandler.php

@@ -207,7 +207,8 @@ public static function installRequirementsFile(CommandEvent $event)
             $fs->copy(__DIR__.'/../Resources/skeleton/app/check.php', $binDir.'/symfony_requirements', true);
             $fs->remove(array($appDir.'/check.php', $appDir.'/SymfonyRequirements.php', true));
 
-            $fs->dumpFile($binDir.'/symfony_requirements', '#!/usr/bin/env php'.PHP_EOL.str_replace(".'/SymfonyRequirements.php'", ".'/".$fs->makePathRelative($varDir, $binDir)."SymfonyRequirements.php'", file_get_contents($binDir.'/symfony_requirements')), 0755);
+            $fs->dumpFile($binDir.'/symfony_requirements', '#!/usr/bin/env php'.PHP_EOL.str_replace(".'/SymfonyRequirements.php'", ".'/".$fs->makePathRelative($varDir, $binDir)."SymfonyRequirements.php'", file_get_contents($binDir.'/symfony_requirements')));
+            $fs->chmod($binDir.'/symfony_requirements', 0755);
         }
 
         $webDir = $options['symfony-web-dir'];