Fix zhihu and dribbble guid conflict (#1428)

问题路由：

```
/zhihu/collection/26444956
/dribbble/user/google
/dribbble/keyword/player
```

lib/routes/dribbble/utils.js

@@ -36,7 +36,11 @@ module.exports = {
                                 <strong>Views:</strong> ${item.find('.views').text()}<br>
                                 <strong>Comment:</strong> ${item.find('.cmnt').text()}<br>
                                 <strong>Favor:</strong> ${item.find('.fav').text()}`,
-                            link: `https://dribbble.com${item.find('.dribbble-link').attr('href')}`,
+                            link: `https://dribbble.com${item.find('.animated-target').attr('href') ||
+                                item
+                                    .find('.extras > a')
+                                    .attr('href')
+                                    .replace('/rebounds', '')}`,
                         };
                     })
                     .get(),

lib/routes/zhihu/collection.js

@@ -27,7 +27,10 @@ module.exports = async (ctx) => {
             list
                 .map((index, item) => {
                     item = $(item);
-                    let linkUrl = item.find('link').attr('href') || '';
+                    let linkUrl = item
+                        .find('a.meta-item')
+                        .not('a.toggle-comment')
+                        .attr('href');
                     if (linkUrl.startsWith('/')) {
                         linkUrl = 'https://www.zhihu.com' + linkUrl;
                     }