fix stream

@@ -2,7 +2,6 @@
 const Router = require('koa-router');
 const _ = require('lodash');
 const md5 = require('md5');
-const stream = require('stream');
 
 const CDNCONFIG = require('../../../config/cdn_config');
 
@@ -37,16 +36,10 @@ const client = {
             };
         }
 
-        let ste = new Buffer.from(JSON.stringify({
+        let readable = new Buffer.from(JSON.stringify({
             files: trimFiles,
             revision
         }));
-
-        const bufferStream = new stream.PassThrough();
-        let readable = bufferStream.end(new Buffer.from(JSON.stringify({
-            files: trimFiles,
-            revision
-        })));
         let config = _.cloneDeep(CDNCONFIG.main);
 
         _.assign(config, {