update composer installers

Author: unfulvio

composer.json

@@ -16,7 +16,7 @@
   ],
 	"require": {
 		"php": ">=5.4.0",
-		"composer/installers": "v1.0.21",
+		"composer/installers": "v1.0.22",
 		"php-console/php-console": "~3.1",
 		"nekojira/wp-requirements": "^1.4",
     "xrstf/composer-php52": "1.*"