Fix cnnot find roles of undefined (#8)

Author: shipengqi

README.md

@@ -83,7 +83,7 @@ yarn global add sactive-bot
 - Bot server authentication
 - Crypto all sensitive information
 - Render card
-- Docker version, kubernetes yaml file
+- Docker version, add kubernetes yaml file
 - Wechat Adapter
   - [WeChat Protocol](http://www.blogjava.net/yongboy/archive/2015/11/05/410636.html)
   - [WeixinBot](https://github.com/Urinx/WeixinBot)

lib/middlewares/filter_middleware.js

@@ -29,7 +29,7 @@ function filterMiddleware(context, next, done) {
       robot.processStatus.str = msg.message.text;
     }
   }
-  // ignore if user doesn't @bot
+  // ignore if user doesn't @<bot name>
   if (!botNameReg.test(msg.message.text)) {
     robot.processStatus.toBot = false;
     return done();
@@ -42,7 +42,7 @@ function filterMiddleware(context, next, done) {
   }
   // ignore message from system user in mattermost channel
   if (robot.adapterName === 'mattermost') {
-    if (msg.message.user.room_name !== '' && msg.message.user.mm.roles.startsWith('system') && !msg.message.text.startsWith('@')) {
+    if (msg.message.user.room_name !== '' && !msg.message.text.startsWith('@')) {
       return done();
     }
   }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sactive-bot",
-  "version": "1.3.14",
+  "version": "1.3.15",
   "description": "",
   "main": "index.js",
   "scripts": {