Commits on Feb 14, 2019

1. 去除 version 字段的 Add 条件 …

   当 结构体开启 version tag 时, 使用 update 方法, 第一个参数(更新的字段)结构体指针中 Version 字段默认为 0, 导致找不到更新的数据.
   调用的方式为:
   ```
   update := &FeedItem{
   	DatePublished: "2019-01-9",
   }
   engine.Where("date_published = ?", "2019-01-11").Update(update)
   ```
   生成的 sql 类似于:
   ```
   [xorm] [info]  2019/02/14 17:36:46.057228 [SQL] UPDATE "feed_item" SET "date_published" = $1, "updated" = $2, "version" = "version" + 1 WHERE (date_published = $3) AND "version"=$4 []interface {}{"2019-01-9", 1550137006, "2019-01-11", 0}
   ```

   yuancjun authored Feb 14, 2019
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