Humanize some errors

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#484 创建于 2017年12月13日 2 条评论 0 个 reaction 已指派 0 人在 GitHub 查看

描述

It's nice for me to have the trail, but more common cases like:

```
Error: initializing: reading config: open up.json: no such file or directory
```

could be summarized and have a bit more copy explaining that it needs an up.json file, and to just run `up` to initialize that.

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