feat: 添加对sketch.com 的beta版本更新支持 (#3028)

lib/router.js

@@ -1106,7 +1106,8 @@ router.get('/nowcoder/discuss/:type/:order', require('./routes/nowcoder/discuss'
 
 // Xiaomi.eu
 router.get('/xiaomieu/releases', require('./routes/xiaomieu/releases'));
-
+// sketch.com
+router.get('/sketch/beta', require('./routes/sketch/beta'));
 // 每日安全
 router.get('/security/pulses', require('./routes/security/pulses'));