feat: Fix link in Github's PR (#3686)

lib/routes/github/pulls.js

@@ -9,6 +9,7 @@ module.exports = async (ctx) => {
     const repo = ctx.params.repo;
 
     const host = `https://github.com/${user}/${repo}/pulls`;
+    const link = `https://github.com/${user}/${repo}/pull`;
     const url = `https://api.github.com/repos/${user}/${repo}/pulls`;
 
     const response = await got({
@@ -28,7 +29,7 @@ module.exports = async (ctx) => {
             title: item.title,
             description: md.render(item.body) || 'No description',
             pubDate: new Date(item.created_at).toUTCString(),
-            link: `${host}/${item.number}`,
+            link: `${link}/${item.number}`,
         })),
     };
 };