fix: prevent lib/core/agent/index.js unexpectly loaded by plugin loader (#35)

Author: njugray

packages/beidou-core/lib/beidou.js

@@ -8,8 +8,8 @@ const path = require('path');
 
 const EGG_PATH = path.join(__dirname, '..');
 const loaderExtend = require('./core/loaders');
-const applicationExtend = require('./core/worker/index');
-const agentExtend = require('./core/agent/index');
+const applicationExtend = require('./core/worker/application');
+const agentExtend = require('./core/worker/agent');
 
 module.exports = function (target) {
   loaderExtend(target);