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update readme.md

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```go
viper.WatchConfig()
viper.OnConfigChange(func(e fsnotify.Event) {
	fmt.Println("Config file changed:", e.Name)
})
```
this code will cause data race,  please check this question:
https://stackoverflow.com/questions/68915944/viper-dynamically-loading-config-file-has-data-race/68919971#68919971
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连修明 2021-08-30 14:48:16 +08:00 committed by Márk Sági-Kazár
parent 38e00eefc4
commit eb876e1a15
1 changed files with 1 additions and 1 deletions
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README.md
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@ -175,10 +175,10 @@ Optionally you can provide a function for Viper to run each time a change occurs
**Make sure you add all of the configPaths prior to calling `WatchConfig()`**
```go
viper.WatchConfig()
viper.OnConfigChange(func(e fsnotify.Event) {
fmt.Println("Config file changed:", e.Name)
})
viper.WatchConfig()
```
### Reading Config from io.Reader