修复 OSChina 可能采集到相对链接的问题 (#1986)

lib/routes/oschina/news.js

@@ -1,3 +1,4 @@
+const url = require('url');
 const axios = require('../../utils/axios');
 const cheerio = require('cheerio');
 
@@ -58,7 +59,7 @@ module.exports = async (ctx) => {
             const item = {
                 title: each.find('a', 'h3').attr('title'),
                 description: each.find('p', '.description').text(),
-                link: encodeURI(originalUrl),
+                link: url.resolve('https://www.oschina.net', encodeURI(originalUrl)),
             };
             if (/^https?:\/\/www.oschina.net\/news\/.*$/.test(originalUrl)) {
                 const key = 'oschina' + item.link;