Archive页面报错的问题

```
#for(archive : archives)
<h3>${archive.date_str}</h3>
#include('./partial/posts_title.html', {articles : archive.articles})
#end
```
变量名错误，此处修改为
```
#for(archive : archives)
<h3>${archive.dateStr}</h3>
#include('./partial/posts_title.html', {articles : archive.articles})
#end
```

版本：tale 2.0.x