Update ConfigCommand to allow setting of htaccess-protect option

src/Composer/Command/ConfigCommand.php

@@ -402,6 +402,7 @@ EOT
                 },
             ),
             'github-expose-hostname' => array($booleanValidator, $booleanNormalizer),
+            'htaccess-protect' => array($booleanValidator, $booleanNormalizer),
         );
         $multiConfigValues = array(
             'github-protocols' => array(