composer config update.

composer.json

@@ -13,6 +13,12 @@
 		"source": "https://github.com/yiisoft/yii2"
 	},
 	"minimum-stability": "dev",
+	"repositories": [
+		{
+			"type": "pear",
+			"url": "http://pear.horde.org"
+		}
+	],
 	"require": {
 		"php": ">=5.3.0",
 		"yiisoft/yii2": "dev-master",