Move vendor directory at top level

cmd/gost/vendor/vendor.json → vendor/vendor.json

@@ -309,5 +309,5 @@
 			"revisionTime": "2016-11-29T15:03:00Z"
 		}
 	],
-	"rootPath": "github.com/ginuerzh/gost/cmd/gost"
+	"rootPath": "github.com/ginuerzh/gost"
 }