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doc: notic check instance return by viper.Sub

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j2gg0s 2020-09-26 12:12:24 +08:00
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README.md
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@ -653,6 +653,9 @@ cfg2 := viper.Sub("app.cache2")
cache2 := NewCache(cfg2)
```
Notice `Sub` will return `nil` when key does not exist.
And you should check new viper instance return by `Sub` to avoid invalid memory address error.
### Unmarshaling
You also have the option of Unmarshaling all or a specific value to a struct, map,