How to: Registering and Using Aliases
Aliases permit a single value to be referenced by multiple keys

```go
viper.RegisterAlias("loud", "Verbose")

viper.Set("verbose", true) // Same result as next line
viper.Set("loud", true)    // Same result as prior line

viper.GetBool("loud")    // true
viper.GetBool("verbose") // true
```