1. Feature: random cover #10

2. Fix: valine lang not work
3. Fix: archives page site name not change when the language change
4. Fix: related posts url error

_config.yml

@@ -276,10 +276,6 @@ google_site_verification:
 # See: https://www.bing.com/webmaster/
 bing_site_verification:
 
-# Yandex Webmaster tools verification setting
-# See: https://webmaster.yandex.ru/
-#yandex_site_verification:
-
 # Baidu Webmaster tools verification setting
 # See: https://ziyuan.baidu.com/site/
 baidu_site_verification: